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Old 01-21-2005, 08:55 PM
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Engine Dies In Drive

Having more problems with my engine. Maybe you all have some ideas.

First off, I am running a 350 with a MAF TPI system on it. Its an 86 system. It is not throwing any codes, and the sensor readings seem normal. Fuel pressure is at 47 and seems okay as well. Base Timing is at 8, but has been tried higher and lower.

Right now it seems to idle great. Nice throttle response and pretty smooth. However, when I put it into reverse or drive, the idle drops suddenly and it dies. If I feather the gas a bit, I can keep it alive and once it makes the transition into gear, it will stay. It will idle okay for a bit, but then it becomes choppy like its missing.

There are no vacuum leaks I can detect. I plugged the line for the Transmission modulator, thinking that it might be going out or something. If I pull the PCV line and take out the valve and let the line sit there, the idle picks up and it idles higher but still smooth.

If I set the idle up, and drive it, it drives decent (not like it should tho) and seems to flutter if I give it a lot of throttle.

Just seems wierd that it idles great in park, but the idle will vary when its in gear.

The last thing I put on was heads, however I had it running great with them. I replaced the manifold gasket recently as it was leaking a bit and put all new gaskets on the upper manifold. Like I said, no leaks that I can detect.

Any ideas? Anything I am leaving out that you need?

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Old 01-21-2005, 10:38 PM
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Check your ignition system, I had a car do that & it had a weak coil. It ran fine when the engine wasn't under a load but as soon as it was put in gear it would do the same as you describe.
This was on a 67 POS Skylark but the princiles are the same. I hope you figure it out.

*principles
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Old 01-22-2005, 12:43 AM
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Did you verify and set TPS position when you reinstalled the intake assembly? I don't know what the exact voltage reading on your year is but I suspect it's about 1/2 volt. The other sensor that can cause a problem is the IAC sensor. Make sure it's plugged in tight, this bleed air at idle to stablize engine operation under variable engine loading, like going from park to drive.

Those are t he only two sensors that might be wacked at idle. Your running condition though sounds like it is wacked as well. Based on that it would almost seem as if a line is either hooked up wrong, a sensor is not connected tight (which you would think cause a code to be set of course) or you do still have a leak somewhere causing eratic sensor operation.
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Old 01-22-2005, 12:57 AM
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failing torque converter can cause poor performance in gear and stalling while putting the car in gear.

Sounds like something that's to be attributed to your recent upgrade, however.

K
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Old 01-22-2005, 06:01 AM
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Yeah. I am more prone to looking at things related to the areas I have been messing with. But it does seem wierd that there is such a rocking in the car when I put it from park to reverse or drive. The truck just really clunks into the gear and the RPM's drop way down with the load.
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Old 01-22-2005, 06:55 AM
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i would say your idle air control is not working, this unit does not always set a code. the reason for it clunking into gear is you probably have the idle turned up to high to try and keep it running. this screw should not be used to adjust idle. by moving it you change tps and iac settings. the iac controls the amount of air the engine needs to stay running, when you put your foot on the pedal you are giving it the air, and the control no longer works untill you take your foot of the pedal. good luck.
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