sold my iroc now i have 96 t/a ws6 woes! HELP
01-07-2013, 07:48 PM
#61
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
yeah i had one done about a month or so ago and a friend looked at it and said everything looked alright except the o2's looked a little out of wack thats why i replaced the o2's. I need to get another one and see what the deal is. im just looking for more ideas of things to check prior to the scan.... maybe ive overlooked something?
01-07-2013, 07:50 PM
#62
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
but even so at wot the o2's have no affect on the way the car performs....
i have the egr unhooked but the valve is still on the intake....
i have checked the diophram and its staying shut.
i have the egr unhooked but the valve is still on the intake....
i have checked the diophram and its staying shut.
01-08-2013, 09:34 AM
#64
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
the car has never ran right since i got the car, i knew it had issues but im half way decent with cars so i figured i could fix it.....had no idea lt1s were a pain.
as far as tests yes i have compression checked it, spark test, and have checked fuel pressure only 38psi, as i rev it jumps to 40. fuel pressure stays consistent after shutting car off.
This morning i went to start it and pull it in the shop and it started normal but as soon as i gave it throtle it boged and almost stalled... acted like that for a few mins then it was reving fine.... I am trying hard to get my friends scanner and do i scan. I dont know too much about the values so im going to post my results and hopefully we will have a better standing point on getting this car back the way it should be.
Chris
as far as tests yes i have compression checked it, spark test, and have checked fuel pressure only 38psi, as i rev it jumps to 40. fuel pressure stays consistent after shutting car off.
This morning i went to start it and pull it in the shop and it started normal but as soon as i gave it throtle it boged and almost stalled... acted like that for a few mins then it was reving fine.... I am trying hard to get my friends scanner and do i scan. I dont know too much about the values so im going to post my results and hopefully we will have a better standing point on getting this car back the way it should be.
Chris
01-08-2013, 11:23 AM
#65
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
alright got a scan done, 14.7.1 afr tps at idle was 0.53 and with car off but with key on it was 4.57 closed and at WOT it was 99 the guy that scanned it for me said it was odd it was only 0.53 at idle????
everything looked fine, o2's work as they should it goes in closed loop spark advance, map, maf everything looks great... no missfires either
geeezzzee im lost anyone have any input on the tps???
everything looked fine, o2's work as they should it goes in closed loop spark advance, map, maf everything looks great... no missfires either
geeezzzee im lost anyone have any input on the tps???
01-08-2013, 11:59 AM
#66
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
GM spec is between .23v and .9v at idle.
Are you saying with the engine off, key on, that the TPS voltage is 4.57v and 99v WOT? I don't see how that is possible.
Are you saying with the engine off, key on, that the TPS voltage is 4.57v and 99v WOT? I don't see how that is possible.
01-08-2013, 12:24 PM
#67
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
The scan can not tell you the actual A/F ratio, only the target A/f ratio. 14.7:1 is the target A/F ratio for closed loop operation.
While the PCM does not accept feedback from the O2 sensors at WOT (actually, power enrichment of PE mode, and not always 100% throttle opening), it does monitor them and will set codes for extremely lean PE mode conditions. Just looking at the PE mode O2 readings will provide an indication (rough) of whether it's running rich or lean, and whether both banks of the engine are balanced.
The only time you would see "99" for the throttle position sensor would be if you were reading TPS percent open (TPP = 99%) and not TPS voltage. 4.57V at full OPEN throttle would be normal, but not at CLOSED throttle and you indicated. 4.57V at CLOSED throttle would indicate a faulty sensor, since it would be reading almost the full 5.0V reference voltage supplied by the PCM... maybe a short between the gray ref votage wire and the blue signal wire.
Maybe you didn't really mean what you typed, but the almost complete absence of punctuation leaves your post open to misinterpretation. Look at how confusing this is:
"idle" = "closed".... how can it read both 4.57V and 0.53V for the same position?
What did the guy who scanned it feel the closed throttle (= idle) voltage should be? As Joe indicated, 0.53V is within the acceptable range, and pretty much normal.
While the PCM does not accept feedback from the O2 sensors at WOT (actually, power enrichment of PE mode, and not always 100% throttle opening), it does monitor them and will set codes for extremely lean PE mode conditions. Just looking at the PE mode O2 readings will provide an indication (rough) of whether it's running rich or lean, and whether both banks of the engine are balanced.
The only time you would see "99" for the throttle position sensor would be if you were reading TPS percent open (TPP = 99%) and not TPS voltage. 4.57V at full OPEN throttle would be normal, but not at CLOSED throttle and you indicated. 4.57V at CLOSED throttle would indicate a faulty sensor, since it would be reading almost the full 5.0V reference voltage supplied by the PCM... maybe a short between the gray ref votage wire and the blue signal wire.
Maybe you didn't really mean what you typed, but the almost complete absence of punctuation leaves your post open to misinterpretation. Look at how confusing this is:
it was 4.57 closed and at WOT it was 99 the guy that scanned it for me said it was odd it was only 0.53 at idle?
What did the guy who scanned it feel the closed throttle (= idle) voltage should be? As Joe indicated, 0.53V is within the acceptable range, and pretty much normal.
01-08-2013, 12:30 PM
#68
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
i feel like a jack ***, i got screwed found the issue
its a 4.3L l99
im at loss for words very sorry for having everyone chase me in circles i will be pulling the motor next week i have a REAL lt1 lined up. gosh i feel like an idiot
its a 4.3L l99
im at loss for words very sorry for having everyone chase me in circles i will be pulling the motor next week i have a REAL lt1 lined up. gosh i feel like an idiot
01-08-2013, 01:12 PM
#69
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
and in earlier posts on here somewhere someone told me to look and make sure it was indeed an lt1 and when i changed my cam out inside the timing cover it was clear as day saying 327. im happy i found the issue and i have a motor to put in it
all fellow lt1 owners beware of the baby lt1 that will most deff say 327 inside the timing cover!
all fellow lt1 owners beware of the baby lt1 that will most deff say 327 inside the timing cover!
01-08-2013, 03:08 PM
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
I believe the casting numbers on the block come from the actual part number GM uses for the blocks. The 350 LT1 part number for the block was 10125327 therefore I believe, (could be wrong) the number on the block is 327 and comes from that part number.
My actual 5.7L 1995 350 CI LT1 I had started to build up and eventually sold to Rich had "327" stamped on it.
I hope you aren't going Purely by that alone.
The number for the 265CI B body engine was 10168588 I would expect to see 588 cast into it.
And one last thing, what does the size of the engine have to do with problems you're having?
I don't believe you have what you think you have and I think you are spinning your wheels in directions you shouldn't even be looking.
My actual 5.7L 1995 350 CI LT1 I had started to build up and eventually sold to Rich had "327" stamped on it.
I hope you aren't going Purely by that alone.
The number for the 265CI B body engine was 10168588 I would expect to see 588 cast into it.
And one last thing, what does the size of the engine have to do with problems you're having?
I don't believe you have what you think you have and I think you are spinning your wheels in directions you shouldn't even be looking.
Last edited by Guest47904; 01-08-2013 at 03:20 PM.
01-08-2013, 04:05 PM
#71
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
no its confirmed its the 4.3 265ci
on the passenger side of the block i saw "588" clear as day and the casting numbers on the back of the block on drivers side i used a mirror and alot of grunting i saw the dreaded 43 on the back by the GM emblem.
When i checked it when i belive it was you that sugested i make sure i didnt have the baby lt1 i was already in the process of taking the cam out and inside the timing cover its says "327" on the right hand side........
im a little anoyed i did not look into this further as it was mentioned, had i looked with a mirror a month ago i would have had the new engine in by now and been happy. Either way it was indeed a learning exp for sure. and its amazing the 4.3L runs smooth with the 5.7 software.
i am leaving for vacation in 2 days when i get back i will be removing the engine and installing the new LT1 5.7!!!!!! thanks for the help guys!
on the passenger side of the block i saw "588" clear as day and the casting numbers on the back of the block on drivers side i used a mirror and alot of grunting i saw the dreaded 43 on the back by the GM emblem.
When i checked it when i belive it was you that sugested i make sure i didnt have the baby lt1 i was already in the process of taking the cam out and inside the timing cover its says "327" on the right hand side........
im a little anoyed i did not look into this further as it was mentioned, had i looked with a mirror a month ago i would have had the new engine in by now and been happy. Either way it was indeed a learning exp for sure. and its amazing the 4.3L runs smooth with the 5.7 software.
i am leaving for vacation in 2 days when i get back i will be removing the engine and installing the new LT1 5.7!!!!!! thanks for the help guys!
01-08-2013, 07:09 PM
#72
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
Wow, I didn't even know a LT1 4.3 was out there.....I had to do some research on them. According to Wikipedia....
"L99 (4.3L)
A 260 in3 (4.3 L) was based on a 305 in3 with updated block architecture to be Generation II and a reduced 3 inches (76 mm) stroke. It was designated the L99, and was introduced in 1994 for the Chevrolet Caprice. It was externally identical to the LT1, but the bore was decreased to 3.736 inches (94.9 mm) and the stroke to 3 inches (76 mm) giving it a displacement of 263 in3. The pistons used in the L99 were the same as the ones used in the Vortec 5000, but 5.94 inches (151 mm) connecting rods were used to compensate for the shorter stroke. This was the base engine used on all 1994-1996 Chevrolet Caprice Sedans, including the Police Package vehicles.
Like the LT1, it features sequential fuel injection, reverse-flow cooling, and an optical ignition pickup. Output is 200 hp (150 kW) and 245 lb%u00B7ft (332 N%u00B7m). Due to its smaller displacement, it provides better fuel economy than the 5.7 L LT1, but at reduced horsepower & torque levels."
A ground pounding 200 HP....wow. Needless to say, that would be a tough one to troubleshoot. Especially since it looks the same on the outside(save for those casting numbers). Nice work in figuring it out(and to who suggested it in the first place).
"L99 (4.3L)
A 260 in3 (4.3 L) was based on a 305 in3 with updated block architecture to be Generation II and a reduced 3 inches (76 mm) stroke. It was designated the L99, and was introduced in 1994 for the Chevrolet Caprice. It was externally identical to the LT1, but the bore was decreased to 3.736 inches (94.9 mm) and the stroke to 3 inches (76 mm) giving it a displacement of 263 in3. The pistons used in the L99 were the same as the ones used in the Vortec 5000, but 5.94 inches (151 mm) connecting rods were used to compensate for the shorter stroke. This was the base engine used on all 1994-1996 Chevrolet Caprice Sedans, including the Police Package vehicles.
Like the LT1, it features sequential fuel injection, reverse-flow cooling, and an optical ignition pickup. Output is 200 hp (150 kW) and 245 lb%u00B7ft (332 N%u00B7m). Due to its smaller displacement, it provides better fuel economy than the 5.7 L LT1, but at reduced horsepower & torque levels."
A ground pounding 200 HP....wow. Needless to say, that would be a tough one to troubleshoot. Especially since it looks the same on the outside(save for those casting numbers). Nice work in figuring it out(and to who suggested it in the first place).
Last edited by ACE1252; 01-08-2013 at 07:24 PM.
01-08-2013, 07:28 PM
#73
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
thanks alot man lol im laughing at it now because i was at the point of pulling my hair out because i couldnt figure out what in the world was wrong with it..... the 200 hp seems to be the issue hahaha it literally felt like a v6 mustang and this is most def the issue.
All said and done ive learned to be a little more careful when trying to troubleshoot something.....
All said and done ive learned to be a little more careful when trying to troubleshoot something.....
01-09-2013, 12:55 PM
#74
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
when i changed my cam out inside the timing cover it was clear as day saying 327.
The LT1 block has the "327" cast in it, as described above. The L99 engine has "4.3" cast on the side.
Here's a good reference:
Rebuilding the Chevrolet LT1 Engine: Engine Builder
01-09-2013, 08:09 PM
#75
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Re: sold my iroc now i have 96 t/a ws6 woes! HELP
im telling you, i used a mirror on the drivers side back of the block and it says 43 right next to the gm emblem on the block,
then on the passenger side of the block between 6 & 8 cylinders it says "588"
whats odd is that as said above lt1 true 5.7 will have 327 on it, i infact have 327 on the inside of the timing cover i saw when i replaced the cam..... now had i looked at block casting numbers as well i could have found the issue a long time ago but i (assumed) that seeing the 327 number i was safe with a true 5.7
let this be good info for everyone just in case this happens to anyone else. i will post pics next weekend when i pull the motor to prove it says 327 inside the timing cover on a l99 motor.....
then on the passenger side of the block between 6 & 8 cylinders it says "588"
whats odd is that as said above lt1 true 5.7 will have 327 on it, i infact have 327 on the inside of the timing cover i saw when i replaced the cam..... now had i looked at block casting numbers as well i could have found the issue a long time ago but i (assumed) that seeing the 327 number i was safe with a true 5.7
let this be good info for everyone just in case this happens to anyone else. i will post pics next weekend when i pull the motor to prove it says 327 inside the timing cover on a l99 motor.....