Question about 1988 Toyota MR2

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Engine pulses up and down at idle. between 700

Engine pulses up and down at idle. between 700 and 1000 rpm what would cause this???

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  • Toyota Master
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Most likely, a bad throttle position switch.

Posted on Jul 19, 2009

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Posted on Jan 02, 2017

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What is causing the fast Idle and slowing down


well gee, there are 50 reasons.
did you scan the PCM yet, if not ,why not?
when the idle surges, that means.
NO RPM ranges stated, if super low rpm check EGR.

1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to...
2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls.
super lean burn.(bogging)
super rich burn, misfire for 50 reasons.

i cant hear your engine,nor feel it, or see it shake from gross misfiring.
no can i drive it and see/feel power loss,
can I?
asking net bunny's this (blind as bats)
is "OVER THE TOP" no?
so here , ill toss the dice for you
and guess gross misfiring.
ever get a tuneup this decade, if not bingo , no?

and the others...

http://jeepdied.com/Misfire101.html

link even has the 50 cause list, to show the futility of guessing!
we do 1 to 10 tests. and find it.
for sure.

as you can see EFI systems are complex.
gue$$ is not only expensive but can net you 2 problems easy.

Feb 05, 2016 | 2002 Jeep Grand Cherokee

1 Answer

'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------


which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

Apr 15, 2013 | 1993 Geo Prizm

2 Answers

Toyota Rav 4 1997 .Check engine comes on .Codes are P0301,302,303,304116 . What to do.


The engine coolant temperature is high. Your other Codes are for missing cylinders on cylinder 1,2,3,and 4. Get the Codes cleared and start over. Changing the plugs and wires,etc could have generated the missing cylinder Codes.

Autozone,Advance, and Oreilys will scan for free.

Check your engine for an IDLE SPEED CONTROL SOLENOID, which may be in the intake. Or a fuel pressure regulator.

A lot of times people work on the spark side and forget the fuel injectors. They can cause a miss.

Nov 03, 2012 | Toyota Cars & Trucks

1 Answer

2004 oldmobile alero stumbles at about 4000 rpm, particularly on hill. battery light comes on briefly when this happens


pushing the accelerator to the floor causes it to go into clear flood mode .the control module reduces the fuel injector pulse width in order to increase the air to fuel ratio. It could be get to much fuel , leaking fuel injectors or a bad fuel pressure regulator . Pull the vacuum hose off the regulator an see if fuel drips from it , if it does the diaphram has a hole in it .

Mar 19, 2017 | 2004 Oldsmobile Alero

1 Answer

1998 Dodge Neon. At low speed or idling, the headlights pulse. They seem to pulse in time to the idling of the engine.


You need to check the amperage output of your alternator. Sounds like it is either too low of rpm`s from your engine or your alternator/regulator is going bad.

May 05, 2011 | Dodge Neon Cars & Trucks

1 Answer

Hi just bought i999 1.6 audi a3 and it has started to pulse when idling and oil light comes on when engine reaches nornal temp what could this be please help


If by pulsing you mean that the idle is fluctuating up and down, this is caused by oil/sludge build up in the throttle valve. To rectify this remove the intake pipe at the throttle valve. Use engine cleaner/degreaser on a rag to clean out throttle valve around throttle butterfly. Open butterfly manually to assist access. The oil pressure light coming on is usually caused by the oil pump pick up becoming blocked by carbon and sludge in the oil sump. If you have a suitable oil pressure gauge, check the oil pressure at the oil switch. Oil pressure should be 3.5- 4 bar at 2000 rpm at operating temperature. If pressure ok, Pressure switch may be faulty. If pressure low you will have to remove oil sump and clean out or replace oil pump pick up. If not done, may result in major engine damage. Sludge and carbon build up caused by oil not being changed often enough. Best to use a synthetic oil.

Jun 13, 2010 | 2007 Audi A3

1 Answer

Engine codes p1133 p0171 p0507 p0131 all at once


Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Regards.

Mar 10, 2009 | 2002 Pontiac Sunfire

1 Answer

Engine pulsing, poor idle


Yes, do check the coil, look real close for any hair line cracks on the side of the body of the coil; if it IS cracked, this is def your problem. Hope this helped. Thanks for choosing FixYa!

Oct 30, 2008 | 1989 Toyota Camry

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