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Idel to high starting, warm to low sometimes dies

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What is to high? 2000RPM, 2500RPM? Also cold idle and start up idle and many other factors vary with make, model and type of engine, smaller engines in most cases need a high start up idle.

Posted on May 01, 2017

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Posted on Jan 02, 2017

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Idels fine when cold if I run it about 5 miles it starts to miss end wont idel then dies


Check the ECT coolant sensor for sticking in a false low range letting engine run rich when warm. Check for vacuum leaks also.

Nov 06, 2015 | Cars & Trucks

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The idel on my 1992 chevrolet lumina 3.1 euro goes high then drops down low in park or in gear what is problem


Could becaused by a few different thing's . Map sensor , idle air control valve , a vacuum leak . Having the vehicle's scan data viewed would probably pin point the problem . Do you know what scan data is ? Is what a professional tech uses to find problems .
084 Engine Mechanical Tests Scan Data for Vacuum Leak
007 Idle Speed Problems Scan Data for Idle These kind of test's are what seperate week end DIY'ER's from a professional tech.

Jul 01, 2017 | 1992 Chevrolet Lumina

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Just turns off on it's own, Wait 60 sec. restart press pedel it dies.


This engine is electronically controlled so the first thing that must be done here is to have the systems control computer tested for fault codes and then do the proper diagnostics based on those codes.

Jun 07, 2012 | 1995 Plymouth Voyager

1 Answer

My 1993 jeep grand cherokee laredo idles rough after warm up. it also idels high around 2000 rpm at start up sometimes and needs to be shut off and restarted to calm idle speed. whats is causing the...


usually rough Idle is not noticable at high ildle. Once it is idles normally try Disconnecting one injector at a time. If the idle stays the same than that cylinder is the culprit. Remove that spark. If it is wet than do a compression test. Should read better than 100lbs of compression.If compression is good take a spark plug and hook it into the end of the plug wire.Lay it across the intake,start the car and watch for spark. If you have spark than you probably have a bad injector. A miss will cause the vehicle to idle high. The computer is trying to keep the car from dieing out. Hope this helps. No spark do a tune up.

Dec 05, 2010 | 1993 Jeep Grand Cherokee

1 Answer

My 1993 firebird will idel low and almost die then go high and repeat but it drives fine and its a manuel


Have you changed the in line fuel filter, sometimes the obvious get overlooked and looking for the more complicated solution, undo the fuel line pipe to the carburettor or fuel rail and switch on the ignition, You will need two people to do this. the pump will start pumping as soon as switched on, fuel should flow constantly, if not change the filter or your fuel pump might be faulty, hope this is of some help.

Sep 19, 2010 | 1993 Pontiac Firebird

2 Answers

When startn car engine cold idels high to low ,up


sounds like the throttle position sensor, I think that is the one that makes it idel rough

Apr 10, 2010 | 1987 Lincoln Town Car

1 Answer

1990 full size blazer starts fine idles then dies


sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know

Aug 26, 2009 | 1990 Chevrolet S-10 Blazer

2 Answers

HIGH IDEL


sometimes the gasket under the trottle body goes bad. spray carb cleaner at the base of the trottle (not down into it) body while the engine is running. if the idle changes your on the right track. its an easy gasket to change.

Jan 08, 2009 | 1998 Chevrolet S-10 Pickup

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