Question about 1993 Oldsmobile Ninety Eight

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Engine runs too fast

My 1993 olds elite engine runs too fast and no one seems to know how to slow it down

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I had to same problem. My engine would idle to fast when stopped. And when I drove, it would accelerate on its own. And if I took my foot off the gas the speed would increase.

My fix was a little piece of plastic called the THROTTLE SENSOR.

But be careful some aftermarkets don't work right and you'll have the same prob. Make sure its manufactured by GM

Posted on May 04, 2009

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1993 toyota tercel,idles up and down at a fast constant rate.but runs well otherwise,no engine light on,checked all vaccuum,egr,throttle bod


If it tends to cut off when no gas given but sometimes idles up very fast & then slows back down, probably the idle air control valve. If so, will have to be replaced to fix.

Oct 25, 2011 | 1993 Toyota Tercel

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When the car is first started the engine idles


If the throttle plate is closing completely, then this seems to be temperature dependent. Probably the intake manifold gasket. These GM engines were extremely prone to that. When the engine warms up, metal expands, and seals the leak. A good mechanic can check out the usual other culprits: cracked vacuum hoses, bad pcv or egr valve, idle air control motor, etc. Then, maybe a smoke test, when the engine is cold.
There was a giant class action suit on these engines for that problem, but payments ran out 2008. So, use high quality gaskets, (FelPro is excellent) the newly revised torquing procedure, and precoated bolts from GM. Don't use the GM orange coolant. It dissolves the gaskets. Good luck

Mar 30, 2010 | 1993 Oldsmobile Cutlass Supreme

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

2 Answers

Moter runs fast then slows down


check for intake leaks or idle speed control problems.

Apr 28, 2009 | 1988 Chevrolet Camaro

1 Answer

1993 olds achieva-gears won't shift-what sensors on transmission


Had this problem when I rebuilt my engine. Turns out, that I had plugged back in a sensor that was previously unplugged. There is a known manufacturer's defect on some Achievas where a sensor on the transmission was mounted upside-down. Symptoms caused by this are primarily the car staying in gear (and thus stalling) when stopped, and failing to downshift while slowing down. Just unplug this pesky sensor, located roughly underneath and to the battery side of the throttle body. Be careful, though, because I don't know if running long term in this configuration will lead to transmission damage (although my transmission doesn't show any signs of troubles now that the thing is disconnected.)

Apr 22, 2009 | 1993 Oldsmobile Achieva

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I have 1993 toyota Tercel, It start good but when I put in drive gear it pick up at very slow speed and when I press accelarator it will go fast, But as soon I left the accelarator it will slow down. Why


If you haven't change air filter do so and something you try to check is the catalistic converter may be plug and is not leading the engine perform good.

Apr 12, 2009 | 1993 Toyota Tercel

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I am owning Nissan Maxima 2000 odo 18500 , runs perfect but when I am going on highway speed more than 140 it's heating up more.Appreciate you suggestion.Thanks


Dear dotcomsha,

140mph is very fast and will run very hot which will keep your engine cleaner than running slow!
Are there any warning lights coming on?
If not don't worry you have to slow down sooner or later.
Just keep it well maintained!
If I can help in any other way please let me know!

jackiaria
Tuesday 02-24-2009 5:25am EST (USA)

Feb 24, 2009 | 2000 Nissan Maxima

1 Answer

Vdc and engine check lights both on


under dash connect together the 2 green multiplugs. The CEL light (Check Engine Light) will flash. Slow then fast. Count the slow flashes then the fast ones. I.E. code 21 will give 2 slow flashes then 1 fast = 21.

let me know the code and I will diagnose for you.

Dan

Dec 04, 2008 | 2002 Subaru Outback

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