car idles real high starting up for the time in the morning. cold weather

Asked by Dec 07, 2013 at 09:17 PM about the 1994 Oldsmobile Cutlass Supreme 2 Dr STD Convertible

Question type: Maintenance & Repair

I have a 1994 olds cutlass 3.4 ,having idling problem when starting  starts up then cuts off. I have to restart the a few time until its gets warm then its find. intake gaskets have been replace , still doing the same thing. should I replace the coil pack?  
                                                                                                   need help bad !!!  Bill

3 Answers

IAT sensor~ or

6 of 6 people found this helpful.

With no other running issues, it's highly unlikely (not impossible) that a coil pack is your issue. Ignition-related problems (like a coil pack, plug wires, Ignition Module, etc) tend to show up most frequently under load (during acceleration) and when the engine is hot. This is where a good diagnostic education helps...because there's a handful of things that could cause your issue. I'm going to assume the intake manifold gaskets were done properly and it's been verified that there are no vacuum leaks... There are a few is the Idle Air Control Valve. This may be your issue, but I hesitate to recommend their replacement because in my 10 years as an automotive tech, I've found that IAC Valves are a very common misdiagnosis for idle issues and more often than not, replacing the IAC doesn't resolve the complaint. How is the warm idle...normal? When it cuts out, does it just start and stall immediately, or does it do anything funky? How does it drive? Any Check Engine light? Details matter.

2 of 2 people found this helpful.

Judge....a faulty IAT will definitely cause issues, but so will a bad Coolant Temp Sensor, Mass Air Meter, etc..... The good news is that the IAT, CTS, TPS, and MAF can all be easily tested by pulling live data from a scan tool (basic cheap tools only pull codes, if you go a step-up, you'll usually be able to read live data.) The first two are just common sense...look at the data: the IAT should be close to the outside air temperature, and will get hotter as the engine heats up. The CTS is about the same, it should read fairly linear as the motor heats up to temp. The TPS can be tested by putting the key to the Run position WITHOUT starting the engine, and slowly depress the throttle from zero to 100% and back down to zero. It should be a smooth curve or a smooth numerical transition if you can't graph. The MAF has to be tested with the engine running and typically the best way to go is the "Stab Test", where you look at the MAF data or graph it and stab the throttle briefly with the engine up to temp and running. Your data should jump up and back down smoothly and fairly in unison with the data from the TPS sensor. I like to graph the two together when I'm using a high-end scan tool.

Your Answer

Add photo

Related Questions

Cutlass Supreme

Looking for a Used Cutlass Supreme in your area?

CarGurus has 108 nationwide Cutlass Supreme listings starting at $1,995.


Search Oldsmobile Cutlass Supreme Questions

Oldsmobile Cutlass Supreme Experts

#1 munron
Reputation 660
#2 tennisshoes
Reputation 410
#3 Tom Demyan
Tom Demyan
Reputation 340
View All

Related Models For Sale

Used Chevrolet Monte Carlo
10 Great Deals out of 1,421 listings starting at $995
Used Buick Regal
156 Great Deals out of 10,671 listings starting at $3,995
Used Chevrolet Camaro
351 Great Deals out of 31,305 listings starting at $2,500
Used Chevrolet Impala
621 Great Deals out of 35,435 listings starting at $899
Used Ford Mustang
692 Great Deals out of 44,965 listings starting at $750
Used Pontiac Grand Prix
29 Great Deals out of 2,825 listings starting at $1,991
Used Chevrolet Corvette
199 Great Deals out of 22,002 listings starting at $2,500
Used Cadillac DeVille
6 Great Deals out of 1,736 listings starting at $2,200

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.