LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

drop in rpms and bog at 2200 rpms

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Old 02-15-2011 | 08:02 AM
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dmarts10's Avatar
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drop in rpms and bog at 2200 rpms

Just like the title says, I occasionally get a sputter or miss at idle or at any speed. At idle the car will barely recover or stall. While driving it will buck and drop about 500rpms. Also, on occasion my firebird will bog at 2000 rpms while in gear and will not allow me above 2000rpms. This doesn't happen often, but it really sucks when it does. I get an ses light when it happens... 36

ObdI, which is an ignition code. I have a new opti, wires, plugs, icm, and coil. I also replaced fuel pump, fuel pressure regulator, the ect sensor, the map harness, and the iac harness, as well as cleaned out the iac and map. Any ideas???

Last edited by dmarts10; 02-15-2011 at 12:46 PM.
Old 02-15-2011 | 11:02 PM
  #2  
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Re: drop in rpms and bog at 2200 rpms

DTC 36 indicates you have a problem with the high resolution pulse signal from the optical cam position sensor in the Optispark distributor. Could be a problem with the sensor, could be a problem with the harness. Pull the short Opti harness connectors on both ends, and look for corrosion or damaged pins.

What brand is you new Opti?
Old 02-16-2011 | 09:05 PM
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Re: drop in rpms and bog at 2200 rpms

already have cleaned out the harness and tested the resistance of all of the wires... does not seem to be the issue. I know everyone recommends going with the delco opti but just didn't have the $ at the time that I replaced it. I bought the opti through summit. http://www.summitracing.com/parts/SUM-850059/.
Again this problem on occurs once in a while, the rest of the time the car drives perfect. Could this possibly be a tps issue, a low battery voltage issue, or a MAP sensor issue? Or is code 36 pretty much always an opti issue?

Last edited by dmarts10; 02-16-2011 at 09:10 PM.
Old 02-18-2011 | 12:28 AM
  #4  
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Re: drop in rpms and bog at 2200 rpms

DTC 36 is for the loss of high res pulse from the Opti - EXACTLY as a wrote it above. The diagnostic involves the PCM counting the high res pulses in between the low res pulses. If the count isn't right, the high res signal isn't right. There is no other possible cause.
Old 02-18-2011 | 08:04 AM
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Re: drop in rpms and bog at 2200 rpms

Thanks. Very helpful! I'm going to switch it out for a delco this weekend. Now the question begins... What should I trade it in for? Gears or a ripper shifter?
Old 02-18-2011 | 08:30 AM
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Re: drop in rpms and bog at 2200 rpms

An aftermarket shifter is a great affitionand a good first step. I'm not a fan ofthe ripper shifter and even took one off a C5 because of the feel. The pro 5.0 is a good one as is the hurst....
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