Question about 1990 Mercury Cougar

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Check engine light coming on and engine reves

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Check your throttle control valve.

Posted on Mar 22, 2011

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Posted on Jan 02, 2017

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SOURCE: rpm revees up and down while driving an check

Take the car to an auto parts store that will download the code that tripped the check engine light. They typically do this for free. Then repost that info. Thanx

Posted on Jan 10, 2010

redds55
  • 2620 Answers

SOURCE: problems with hesitation of acceleration and check

First you need to get the trouble codes out of the computer.If you don't have a scan tool then take it to your local auto parts store and they can retreive them for you and then we can go from there.

Posted on Aug 05, 2011

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Alternator ford aerostar


To remove the lead from the battery to the alternator while it is running is to invite a destroyed alternator . Varying voltages with engine RPM is indicative of a bad battery or problem alternator regulator . Have a load test done on the battery to check for cell problems and have the alternator bench tested to check the performance .

Feb 24, 2014 | Cars & Trucks

1 Answer

1995 Boneville 3.8 no supercharge. starts and idles fine but when reved up to about 2000 rpm starts missing/backfiring badly.exhaust would become red when reving up.removed cat converter did not look bad...


you need to check the 02 sensor that is on the engine

the converter is probably blocked if it is turning cherry red.

try putting some fuel cleaners in your system like heet from auto zone

you need to make sure the wires are in the right order

make sure there are no breaks in the wire

if you have a check engine light, you should take it to auto zone to get it tested for a better insight

Dec 05, 2010 | 1995 Pontiac Bonneville

1 Answer

Rpm revees up and down while driving an check engine light comes on


Take the car to an auto parts store that will download the code that tripped the check engine light. They typically do this for free. Then repost that info. Thanx

Jan 10, 2010 | 2003 Toyota Matrix

2 Answers

The engine revs up when its is idling


Sounds like either an idle air control valve or a TPS sensor. These items will cause a check engine light to come on as well.. I recommend heading to an AUTOZONE or an AAMCO and you can get the check engine light checked for free. Hopefully you dont live in California cause then you can only go to AAMCO cause AUTOZONE cant do it in California. Good luck

Dec 07, 2009 | 1999 Daewoo Lanos

1 Answer

Clicking Noise Coming From Under The Hood


Have you checked your belts? A piece of belt may have come off and been slapping under your hood, and then fell off completely. While it was slapping, your computer would have detected the slow down of pulleys etc. and caused your engine light to come on. Then when the piece broke off, everything would be back to normal. Let me know!

Apr 08, 2009 | 1998 Lincoln Town Car

2 Answers

Engine looseing reves when driving. reves above 8000rpm when idle


My engine light is on in my 199 ford explorer and I was told it is the o2 sensor 1 and 2 what does this mean?

Feb 18, 2009 | 2000 Volkswagen Passat 4Motion

1 Answer

Reving High


Did youmtry disconnecting the battery for five minutes, then reconnect, start engine and let it idle for 5 minutes with everything off, including radio and heater. If this don,t work you may have a faulty position sensor. I hope this helps.

Jan 21, 2009 | 2001 Hyundai Accent

2 Answers

Engine check light


go to nearest auto they will hook to computer and give you a code

Dec 27, 2008 | 2004 Kia Rio

1 Answer

1996 TBird 4.6 auto/overdrive trans problem


Your transmission fluid contain water,thats why the colour of the fluid changed to pink.And of such the clutch is slipping causing the engine to reve up before shifting - Check transmission cooler.

Aug 21, 2008 | 1996 Ford Thunderbird LX

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