Having problems with your 1990 Chevrolet Lumina APV ?

1999 chevy lumina sedan stalling

\015 Have a problem with stalling. This car had not been driven in a year and we had a complete tune up done on it two weeks ago. The car will go for miles and suddenly stall. It always restarts on the first try, but keeps on stalling constantly. Took it to a mechanic who noted that the filter was filthy and he replaced it. He drove it 8 miles with no stalling. However when my son picked it up from the garage it continued to stall. It is now back at the mechanics for another look. The mechanic is puzzled because everything checks out fine. We wondered if it has to do with the fact that it sat in the driveway for a year without use or that the gas may have not had a high enough octane or was simply cheap or watery gas. Any thoughts?\015 Posted / edited by AnonymousUser on : 25-05-2020

Answers :

Regular petroleum gasoline from 87-93 octane will become stale after it has set for as long as you stated without adding a fuel stabilizer before it was out of commision for whatever reason. First, I would have the tank/ fuel system purged/drained of old stagnant fuel, second I would replace the fuel filter, next I would check for adequate fuel pressure at fuel rail, Also as another point to remember certain types of electronic components such as fuel pumps can fail to operate from sitting around and not having a sufficient amount of overall use I just had to recently replace one in my jaguar for this specific reason so it is best to start your vehicle for atleast 20-30 minutes every 3-4 days when not in regular use to keep it functioning properly. Back to your problem, next since your vehicle has had a complete tune up, in which I interpret that to be an oil change, air filter, spark plugs, plug wires, and full engine diagnostic scan and/or full oscilloscope reading I would suggest having a professional fuel treatment cleaning to ensure your injectors are not clogged from any old residue,dirt or other debris. Once that is done fill it up with 93 octane add a bottle of isoheet fuel additive which should dry up small amounts of water or moisture from contaminated fuel sources, cheap gas or moisture accumulated from possibly filing up on rainy days. If your problem is not corrected at this point take it to the dealer for more scrutinous diagnosis and repair. let me know if I can be of further assistance
You don't say what motor is in your car? i had the same problem on my buick with a 3.8 liter and it was the fuel pressure regulator! find your fuel pressure regulator (top of the motor) after you've run the car, turn it off and pull the vacuum line off the pressure regulator and see if gas comes out of the vacuum line. if it does your problem is the regulator!! hope this does it! craig
Repair Help & Product Troubleshooting for 1990 Chevrolet Lumina APV

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