V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

Engine starts immediately then stop

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Old Oct 5, 2014 | 01:21 PM
  #1  
Mykogee's Avatar
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Engine starts immediately then stop

I have a 89 camaro 2.8 mpfi just yesterday I went out to start the car and it cranked and turned on then stopped immediately.
Checked for codes, got code 34 (MAF sensor) . I had cleaned it with maf cleaner before and today I took it off to clean again no luck.
Then I tried starting it without the MAF and it stayed on except it was rough, seemed like it wanted to die but then it would shoot up to 2500-3000 rpm then again go down really low (about to die) then shoots up again.

It seems to me that it's a much deeper problem then just the MAF sensor.
Going to get a new MAF maybe today but I would like some input on what you guys think it is low airflow? Or maybe flooded engine?
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Old Oct 5, 2014 | 01:26 PM
  #2  
88Camiroc's Avatar
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From: USA
Car: 88 iroc
Engine: 350 4-bolt main 010 bored .040 over
Transmission: t-5 manual
Re: Engine starts immediately then stop

If that is the only code you are getting then i would start with that. It sounds like the MAF sensor might be defected. What it does is to calculate how much air is being pulled through the engine and if it is reading that there is too much air then it will send a signal to the PCM to cut back fuel. It might be telling the PCM to cut back so much that it stalls outs. When it dies can you start it back up again?

As far as the engine being flooded on a MPFI engine that is not very likely. If it was carburated then maybe yes but on MPFI not thats probably not the case. To think to severe yet start with the basic and simple things first and then go from there.
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