Question about 1996 Mazda Protege

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96 Protege....Rough idle in D Ok in P or N. Have checked all the usual suspects.... Also had throttle body cleaned, checked vacuum hoses and did tune-up....fuel filter is old, but don't think that is the problem

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One thing that can cause this is the o2 censor and a clogged catalytic converter

Posted on Feb 11, 2010

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2002 dodge ram 4.7 rough idle and sometimes dies at red lights or stopped in traffic i cleaned throttle body no change could it be my map sensor going bad? Can i clean it? Where is it located

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I'm not sure what you mean by "under load", maybe with a/c on, etc. Also is it really an engine misfire or a rough idle. If it really is a misfire, a scantool at your local parts store should be able to read a code for that. Sometimes a rough idle could be due to just a cracked or disconnected vacuum hose or dirty throttle body. You didn't say whether it runs ok at highway speeds. Sometimes a rough idle can be cleared up a lot with throttle body service or injector flush. Sorry, this is the best I can do with information provided.

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Revs up while idling

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1 Answer

Engine vibrates in idle real bad

sound like idle speed low idle you need to remove throttle body clean entire throttle body spray cleaner down throttle body bore if cleaning throttle body dont help the dealership has to check it out.a faulty egr valve could be stuck partially open that will cause rough idle and stalling. replace air filter clean fuel injectors.your fuel system could be too lean caused by clogged fuel injectors or weak fuel pump check fuel pressure and also check all intake vacuum hoses make sure pcv valve working should have suction and make sure its in place and the pcv valve hose not cracked open or damaged.

Nov 16, 2011 | 1994 Chrysler Concorde

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Mitsubishi Galant 1989 GSR 2.0 litre DOHC engine have idle problem where engine idle (at operating temperature) is rough (HUNTING) and engine speed varies between 800 to 1300 revs (Fuel Inj Cleaned 4...

check for vacuum leaks ---transmission actuator and hose
vent control hoses , any where the there is vacuum control
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PO171 OBD-II Trouble Code " System Lean To Bank 1

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

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check your transmission fluid,the motor will stall when fluid is low

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