I had the MAF replaced 3 weeks ago due to a cold no-start that flooded the engine. That seems to be fixed and the cold starts are much better. The MAF was found to be out of spec by a local shop. The occasional hot restart stumble issue was going on before the MAF was changed and seems to be unaffected by the MAF replacement.. What do you think this could be? The car runs real good otherwise,
Ok thanks- the IAC is new so I'm pretty sure thats okay. Tthe FPR is at the of the list to check. The MAP sensor is the only other suspect I've been reading (on other forums) that has solved similiar problems. Any thoughts on that sensor? Mine is the original - never replaced it ( except for the PCV underneath).
Hey Ken, I have the same thing with my car. When I stop to get gas or stop at all and kill the ignition after I have been driving for over 15-20 mins It wont crank up unless it has been sitting for a few minutes.... I mean It start but it usually just coughs on the first attempt then I let it sit for a minute and it starts.... I also am trying to fix this
2001 Impala LS 81k as of Nov,2011
3.8 V6 3800 Series 2
Glad to hear from you. If i ever get this thing fixed I will be happy to share the solution. As it stands now. I hope to get this fixed myself with a minimum of guess work. If that doesn't look like its going to be feasable then I'm going to have the dealer look at it.
Havent had that happen yet -in fact it it drives perfecly. Good gas mileage and lots of power form the 3.8. The prospect of the hot start problem 50 miles from home where its been 15 degrees at night turned in to reality yesterday - so , yes, its definetly a priority now,
Posted: Sat Feb 27, 2010 12:22 pm Post subject: Update
Here is an update on the problem which I believe may be fixed.
Since my last post, I spoke with a mechanic who tells me that my problem sounds like a vacuum leak. I did find a damaged oring on the PCV valve and the PCV itself didnt appear to be seated all the way.. For good measure I also replaced the IAT sensor ( the new one makes the OE one look like a childs toy) and the air filter. (which is real close to the incoming air horn). So far in the past 3 weeks the restart idle has been very smooth with no bouncing up and down before settling in at about 750 rpm. Incidently, the upper and lower intake manifold gaskets had been replaced with the new versions about 15k miles ago by the dealer.
I had a similar problem about 3 years ago with my Imp... Turned out my fuel pump was starting to fail... Finally one day the car would not re-start at all... Mechanic replaced the fuel pump and it's been perfect since...
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