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OK, I have a 94 Galant with about 140,000 miles on it. This past month something really weird has happened to me three times that I'm hoping so Arsians out there can clue me in on.
My car normal idles at ~600rpm, put it in neutral this is where it sits or if you're stopped at a light. Well three times now when I started it up the engine starts revving. It will rev up and down between 1,100 and 1,600rpm. It will shoot up to 1,600, drop down and as soon as it hits 1,100 it shoots back up to 1,600, over and over. It does this when it's in park or neutral. If I sit in drive at a light it refuses to drop below 1,100rpm.
It just randomly happens, I'll start up my car to go to eat dinner and it does it, when I'm done with dinner and go home it's fine. I've tried turning it off and then back on immediately when it happens and it still does it. I've tried revving the engine in park and that doesn't affect anything. The only thing that seems to work is time, if I let it sit for 30+ minutes, next time I start it there is a very good chance it won't happen. However, the times it has happened my car has been sitting anywhere from 30 minutes to 4 hours. Like I said it's random.
Anyone have this happen to them? Anyone know why it's happening? Any advice is appreciated.
Its your choke revving up the engine untal it warms up. Once its warmed up it should not do it. If it does then the choke is stuck. Spray with some WD40.
It maybe more but simple stuff 1st. Mike
Question... are the ACTUAL RPM's rising and falling.. (the actual engine itself?).. if the engine is NOT actually revving up and down... doesn't really matter... BUT, if the engine IS revving up and down.. you need to have a professional to look at it..this could cause damage if it decides to rev real high or/and then stop!!
Have the engine checked for vacuum leaks, that will cause a high idle speed. As a 35 year veteran of auto repair I can tell you that engine flushs are a 100% waste of your hard earned money.
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