Idle jumping between 1000 and 1500 rpm after the motor heats up..
87 mr2 - On a cold start the idle is 2000rpm steady, but after the engine is warm the idle is not steady at all. It bounces between 1000 and 1500rpm at a constant rate. I'm hoping it is a vacuum leak but I am not mechanical and don't know where to start. Any help would be appreciated. Also...and maybe more aggravating is the oil pressure, temp, and fuel gauges are not working. I (again) am hoping it is just a fuse but dang if I cant find the fuse box. I know there is one in the front compartment, and one just left of the clutch but they do not seem to control those gauges...any ideas??
Re: Idle jumping between 1000 and 1500 rpm after the...
Dear sir your head gasket is cracked leaking the 4agelc engine is known for the #2 cylnder head gasket to go if however this has been going on for some time antifreeze is dumping in to te crank case compromizing the bering journals the other stuff is not related ive owned these cars before threre fun as hell to drive bu money pits dont beat the car you may be able to get the head done if you can afford it over 2,500 the car will lope or hunt for a idle beacuse ani freeze going past the o2 sensor the ecu doesent know how to correct rich or lean
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All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.
chk/test yr plugs also. If it starts to break down then chk soliniod & coil as u may be getting the start of a bigger problem. yr symptoms r showing signs of an elecrical problem. rough warm ups r the signs. c/be choke sensor also causing roughness..
sounds like the idle air control sensor is bad or it could be the idle speed control sensor(module) both can be found on the throttlebody. but to be sure you can take the car to auto-zone and they will run a free diagnostic even if you dont have a check engine light there still may be a code stored.
that is not a probelem it is the fuel system warming the engine and turbo
you should always warm up a turbo car before jumping in and taking off and cool the engine before shuting it off turbos are the most temprelental engine part there is. those steps will prolong the life of the turbo and engine. my starion with the g54b 2.6 does the same thing