RPM's When Starting ?!?
#1
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Join Date: Apr 2003
Location: Reno, NV
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RPM's When Starting ?!?
When I start the car, my RPM's go up...Like it should because of the warming thing. But about 50% of the time, it goes up, down, up, down, etc. then finally settles to where my idle is. What would cause the RPM's to go up and down when its just supposed to go up to like 3k, then back down to idle? And yesterday I noticed the car kinda doing the same thing while I put the car in natural when cruising down from 40mph or so. Any help?
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#9
I R SAD PANDA W/O BAW
you can find a vac leak by using carb cleaner and spraying it on hoses and vac lines while the car is idling. If the engine bogs you most likely have found your leak. You can also do this with a garden hose running a small stream over vac lines.
#10
sold--no longer in debt
I kinda have the same thing, when I start it revs to 2k.. then kinda bounces around at 1.5k, then settles down to a lil under 1k.. this is on a newly rebuilt motor (750 miles) and when im cruising it almost always idles fine at stoplights and such
#11
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Join Date: May 2003
Location: Grand Blanc MI
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The bouncing (about 1.5 second intervals) happens to me sometimes when I run it hard, then let it sit for about 5 minutes, and start it back up. Once I start driving normally, it goes away.
#12
mine had been doing the exact same thing, seemed to start in the winter (very cold... around -15 F)... and now that its the summer it seems to be going away... im not sure what it might have been (tps is set... no vac leaks i can find)... im gonna be tearing apart the entire intake manifold to portmatch / clean it and replace all the gaskets, so maybe that will fix any vac leaks it may have
#14
the tps is the black sensor sitting in front of the throttle body, depending on your series of car it either has 1 or 2 black boxes with cylinders that move in and out of them... and is wired into the wiring harness, it basicaly tells the ecu when the trottle is closed
the upper intake manifold is part of the cast aluminum intake piping on top of the engine (it is between the plenum (box shaped thing after the throttle) and before the lower intake manifold, which bolts to the engine's intake ports
you cant turn off the tps without ditching the ecu... so no
the upper intake manifold is part of the cast aluminum intake piping on top of the engine (it is between the plenum (box shaped thing after the throttle) and before the lower intake manifold, which bolts to the engine's intake ports
you cant turn off the tps without ditching the ecu... so no
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CaptainKRM
2nd Generation Specific (1986-1992)
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08-26-15 09:52 PM