Question about 1987 Toyota MR2

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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??

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  • madthom2 Feb 23, 2009

    I finally removed the 'blue million' screws and replaced my entire instrument panel. Parts were cheap. It was just a pain. No problems since. I changed mine finally because the graphite, or whatever they inject into the speedo cable, had worn out and on cold days it made the most God awful sound, then gauges acted up, but everything checked out OK. So, I replaced it.
    You might consider this. The idle? Vacuum possible, but vacuum shouldn't change much with temperature changes.(?) I would look at more simple ideas like O2 sensors. These can make your idle go up and down constantly while at idle.
    I am the original owner of a black on black '87 MR2 w/black alloys. I removed all strips and MR2 mud flaps in back. People always ask "what in the world is that?". I love it. It's in the shop awaiting a few new body parts from a smack on front pass. wheel. Only mech. damage was bent inner tie rod. Demolished the fender and headlight assembly. I'm painting it plain jane glossy black with several clear coats. Then I'm thinking of airbrushing 2-4 neon colors from the Ferrari air intake to tail lights in form of bright neon interlacing lightening. Other than that I keep it plain and simple with a bra on front. I plan on losing the flip headlights and fabricating fixed headlights with bubble lens. That'll confuse them. My only emblem is the original Toyota emblem on front hood, and it's under the bra. I owned a 1971T Porsche in show room condition. Just dumped $7000 in the engine, parked it in my drive while getting my new '87 MR2 (B'day present to myself) out to celebrate. Returned and a drunk w/no license or insurance knocked it thru two yards coming to rest in a heap on neighbors front doorstep. I salvaged the engine. What a bummer. So, my MR2 and I have bonded. I'll never sell it and I've been offered plenty.
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Check your IACV idle air control valve

Posted on Apr 06, 2011

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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

Posted on Feb 13, 2009

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