Car bogs, stumbles, misses, but only when hot.
#32
Re: Car bogs, stumbles, misses, but only when hot.
Originally Posted by MRBoss429x
should I start with ignition coil and ingnition coil module first or plugs and wires?
#33
Re: Car bogs, stumbles, misses, but only when hot.
How do I check fuel pressure. Im going to pick up a gauge. Do I attach it to the shrader valve and turn the key, but not the engine one to get fuel running, then try at WOT? Should I do this when the car is running fine or after 20 mins when its poopy? I read shoeboxs thing but need a little more help. Mine is 93 btw. THanks
#34
Re: Car bogs, stumbles, misses, but only when hot.
Originally Posted by 84 monte SS
Your passenger side 02 sensor is bad i had the same exact problem. Miss and everything, went to change the plugs one side was black the other side normal. Changed the 02 on the black side and BAM problem gone.
Last year autozone couldnt cause of the obd1 with obd2 style connector. Maybe they have better tools
#35
Re: Car bogs, stumbles, misses, but only when hot.
You dont HAVE to get it scanned. Just Swap the 02's from side to side and see if the problem follows. That will tell you if its really the 02. Its kinda obvious that its the 02 sensor being all the plugs on one side were black. If it was opti or fuel pressure the fouled plugs would be random. The 02 sensors are the only thins that control an entire side of the motor. Also if you have headers on the car and had to slpice in extentions for the 02 that maybe a connection is bad. Let me know if you figure out the problem.
#36
Re: Car bogs, stumbles, misses, but only when hot.
Originally Posted by 84 monte SS
You dont HAVE to get it scanned. Just Swap the 02's from side to side and see if the problem follows. That will tell you if its really the 02. Its kinda obvious that its the 02 sensor being all the plugs on one side were black. If it was opti or fuel pressure the fouled plugs would be random. The 02 sensors are the only thins that control an entire side of the motor. Also if you have headers on the car and had to slpice in extentions for the 02 that maybe a connection is bad. Let me know if you figure out the problem.
Thats why I was stumped to see the passenger side plugs all carboned up.
I will get back to you as soon as they arrive.
#37
Re: Car bogs, stumbles, misses, but only when hot.
Possible clogged catalytic converter. I had the same problem and removing the cat solved it. Also could be faulty o2 sensors. That would explain why its running ****ty in closed loop.
#38
Re: Car bogs, stumbles, misses, but only when hot.
Originally Posted by MRBoss429x
My car runs like an absoulte champ for about 20 mins and then it hits the fan. It will start to miss and the car will be jerky. If you give it gas it doesnt go anywhere and just backfires and I have to limp home. Wait a while start it up and its fine. Its probably ignition related but does the fact that its only when its been run for a while point more towards one thing like the coil, opti, plugs/wires. I think Im going to change the plugs/wires first and rule out cheaper stuff first, sound like a good idea? Thanks.
Mine has a horrible miss and the biggest problem I've noticed and everyone around me has noticed has been the ungodly backfiring/popping.
#40
Re: Car bogs, stumbles, misses, but only when hot.
Well fuel pressure was 39.5 with the lines primed and 37.9 at idle warmed up. Those are of the regular specs but dont know if this means its my problem. Im changing plugs/wires right now and have done the drivers side and was disappointed because the plugs/wires dont look all that bad. In fact they look pretty good so its not lookin like that was the problem.
#41
Re: Car bogs, stumbles, misses, but only when hot.
Originally Posted by Gripenfelter
Put 2 fat washers behind each coil stud. Heat from the head could be causing the ICM or coil to miss.
#42
Re: Car bogs, stumbles, misses, but only when hot.
Originally Posted by chrism400
I would do this next. Fuel pressure is not your problem if you are in the upper 30's.