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After engine swap engine will not rev past half throttle

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My peugeot 406 1.8 XU revs up when started from cold. It then settles down but hunts up and down. It has done this for the past 2 winters. OK in the summer. Have changed the coolant temp probe. Not solved....


You need to clean the throttle valve and the automatic idle speed control valve, follow the procedure below.
Buy a can of spray throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional

Feb 15, 2012 | 1999 Peugeot 406

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My mazda mx5 <1600cc>at normal operating temperature idles at 800 revs,after about 20 seconds the revs drop to 400 revs,after 5 seconds they return to 800 revs,this problem is continuous at idle.This...


Hi,
Sounds like a tune up is in order.
You can mask the problem by changing the fuel filter and spark plugs.
Also there is a small adjustment screw at the throttle linkage. Open the hood and stand close to the battery. Have someone rev the engine and look for the circle or half circle looking spring like mechanism.This is your throttle. Take a small screwdriver or other wrench [ some have different adjustment screws] and simply turn the screw you will see as the adjuster in about 1.4 turn until you are happy with the idle.

Aug 12, 2011 | 1992 Mazda MX-5

1 Answer

93 chevy suburban v-8 tbi hard to start, but starts, will run but will not idle, can keep it running or driving as long as you rev engine constantly. Holding engine at half throttle it will slow and die. ...


Assuming your engine is in good mechanical condition, there are only a few options.

1. You may have a vacuum leak.
2. The pickup in the distributor may be worn to the point that it is sloppy at idle but normal at higher rpm.
3. Idle control valve/motor may not be working properly.

It probably isn't an ignition related problem as the problem would normally get worse as RPM increases. I've seen #2 about 5 times in the past year or 2 so it's not uncommon and would recommend replacing the entire distributor if you come to that conclusion, but would definitely check all vacuum hoses first.

Jun 24, 2011 | 1993 Chevrolet Suburban

1 Answer

The eng. will not go over 2000 rpm


disconnect the throttle cable from the throttle body and try to rev the engine

if still cannot rev past 2000 then suspect MAF (mass air flow sensor) or the throttle body...remove the snorkel and check to make sure the throttle plate is moving freely

finally, if when the accelerator cable is removed and rpm's rise above 2000 then suspect the accelerator cable and/or gas pedal

Apr 05, 2010 | 2002 Jeep Liberty

1 Answer

I have a suzuki 2000 grand vitara wont rev past 2000rpms replaced airflow meter with used one also tested fuel pressure at 40 psi repaired evap hose at tank but problem persists smell unburned gas coming...


hay man thanks for the help with the sonoma hmm seems u got a lil problem, did you buy the car that way? sounds like some kind of rev limiter going out of wack but also mabey possibly throttle pos sensor but then i would think you would have check eng light, also spray some water at night time on ur spark plug wires(to see if there arking) even if they look ok they may be bad at the boots only arking when your reving it, sum lady is trying to sue me for 500 cuz i was doing a wheel bearing on an 03 suzuki and i cracked control arm bolt in half had no inspection hole i dont like suzuki cars but i love there bikes thanks again man

Dec 30, 2009 | 1993 Nissan Altima

1 Answer

Starts O.K. Lacks pulling power. Will not rev to full power.


check for a clogged exhaust look at catalytic converter it could be stop up.

May 24, 2009 | 1999 Suzuki Vitara

1 Answer

My 91 dodge spirit es doesnt rev. up


it sounds like you have a blown head gasket

Jan 04, 2009 | 1990 Dodge Daytona

3 Answers

Car wont rev past 2500rpm


that maybe what the rev limiter is set for.That way you can not over rev causing engine damage.

Sep 12, 2008 | 1996 Nissan 200SX

1 Answer

Won't rev past 2000 rpm


Check the computer on the car it may be programmed to run still on 2 K rpm you need to reprogram the computer on your car.......

May 27, 2008 | 2001 Hyundai XG300

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