Question about 1993 Geo Metro

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2500 rpm causes rpms to drop and rise - 1993 Geo Metro

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Hot or cold.?? engines.?

Posted on Sep 14, 2014

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Have a '99 silverado that will not idle


I would check the idle air control valve that is the what controls rpms

Apr 15, 2013 | 1999 Chevrolet Silverado 1500

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'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------


which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

Apr 15, 2013 | 1993 Geo Prizm

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I have a 1984 rochseter quadrajet. how do you adjust the A.P.T. adjust ment screw


It's called the tip in procedure. You need to run the engine at 2000-2200 rpms and gently cover the choke opening with your hand. If the rpms go up about 100, it is set right. Too much of a rise in rpms, or rpm surging means it is too lean. No rise in rpms means it is too rich. If you pull a vacuum line and the rpms increase, it is too rich; pulling the vacuum line should keep the rpms steady or cause a slight drop. You need to remove the air horn to access the APT screw. You knock out the aluminum plug and install the air horn again to adjust while running the engine. You can 3/8 tap and plug the hole for easy access or drive the aluminum plug back in when done. Turn the APT screw Clockwise to lean it out and counterclockwise to richen it up. To turn it, make a tool with a 5/16 x3 bolt. Cut a notch in the bottom with a hacksaw or grinder about 1/8" wide. The bolt will fit into the hole with the air horn.

Jul 09, 2011 | 1984 GMC C2500

1 Answer

Check engine light on. Will not rev up over 2500 rpm. Fluctuates between 2000 and 2500 rpm and runs rough. Upon first start, you can rev fine and it runs smooth as long as you hold the rpms over 3000. ...


Hi, there are a lot of things that could cause this behavior, so it would help us to diagnose your problem if you could get a scan of the OBD2 connector and send us the trouble code. If you live in the US you can usually get a free scan at your local parts chain.

May 19, 2011 | 2004 Dodge Durango

1 Answer

Sluggish acceleration. High RPM, High Oil Pressure


I hope I'm wrong but I think your torque converter is failing. Sorry, Gary

Jul 27, 2010 | 2003 Chevrolet Blazer

1 Answer

Engine knock hard over 2500 rpm


Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

Aug 22, 2009 | 1996 Dodge Stratus

1 Answer

Rpms drop and rise while driving and stopping.


anytime you can smell gas, you have a leak, not good to drive if you can smell strong fume and not safe to drive. check all fuel line and fuel filter connection. check gasket on intake manifold and your injector. The rpm goes up and drown erratically, check your distributor connections and the ground wires. If distrubutor has bad ground or conection can cause erratic behavior RPM guage.

May 10, 2009 | 1994 Chevrolet Cavalier

2 Answers

My car will only rev to 2500 rpm in drive or in


bad mass air flow meter replace it also check for a ecm update at the dealership goes by vin pretty common problem

Feb 28, 2009 | 2003 Nissan Maxima

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