God1590

As the title says I have a 91 Lumina Euro, with a 3.1 engine. When it warms up it starts bucking and eventually stalls out. I can start it right back up and it will idle just fine, but if I put it in gear and give it gas, it dies right away.

The only code it's putting out is a 34 which is a Map sensor error, book says to replace it which I plan on doing tommorow. This is going to be the 2nd Map sensor I've put in it, and I have a feeling that it's not going to fix it.

I've put alot of work into this car so far, and any help to figure out this problem would be appricated.

richtazz

code 34: MAP sensor voltage was too low for 1 second when engine speed was under 600 RPM, or MAP sensor voltage was too low for 1 second when engine speed was over 600 RPM and throttle angle was above 20%.

First, I would check the vacuum line that runs under the upper plenum to the MAP for cracks/leaks.

Last, since this code depends on a signal from the TPS regarding throttle position, if your TPS has a bad/flat spot, that could also trip this code.

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God1590

Thanks for the info, Hopefully one of those 2 things is the problem.

God1590

Replaced the TPS and the vacuum lines (Found a small hole in one), car ran great for about 10 miles. Car died right before I hit a major road (thankfully), Still putting out a 34 error code.

Any more help would be appricated.

richtazz

I assume you've cleared this code after doing the repair and it came back yet again?

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Would you drive any better with that cell phone up your ...?!

God1590

Yep, saftey first, unplugged the battery before I worked on it.