Hello I need some help for my 91 camaro
the RPM jumping and there is no stability

http://cdn.top4top.net/d_e2a178d88a1.mp4

 

Have you visually inspected all spark plug wires for burns and made sure they're all snapped on the plugs and distributor cap and coil?

 

I inspected the wires on the cap only


But I discovered when inspected for the wires , oil leak from the power steering gearbox

 

That wouldn't cause the problem but some burnt wire or wires grounding on your exhaust manifold would.

 

Thank you for your help
I'll take the car to the electric to check wires

 

But you were already checking the spark plug wires at the distributor. Just follow them down to the plugs checking for burns and making sure they are snapped onto the plugs...

 

can I remove the wires from the coil one by one ?
no problem If I remove it ?

 

Removing them 1 by 1 will make it easier to put back correctly after visual inspection.

 

bad pickup coil on dist will cause the tach to jump.

 

Thanks for help
the image very excellent its help
But it is difficult to reach the spark from top of the engine
I'll try

 

Car turn off when I move to R or D

 

you check all the wires yet?

 

misfire at the plugs won't cause the tach to jump.

 

not yet because cant reach all sparks

 

You should be able to reach around enough to check them. I had this problem a lot with my z28 before selling it. They would get on the manifolds. Some of the plugs you have to get under the car to get.


I know that when the wire did get burned it would run fine till it grounded out on the manifold car would lose power overheat ect... That's when id get to lookin around and find the burnt wire.

 

This could also be caused by a bad ignition module. Just had the one in my 91 go out last week. It will cause the same problems with the tach jumping and the car surging and finally stalling. It's worth taking it out and having it tested.

 

To reach enough should I have RAMP or floor jack
I'm will buy one soon

 

Can I fix it or need to buy a new one ?

 

which one are the RPM regulator

 

the 1 on the left is your idle air control valve. The 1 on the right is your throttle position sensor

 

I would recommend a jack since it would be more useful later on. Also for an ignition control module you would have to replace it. It's about $50.

 

My 1989 Camaro IROC-Z has the 5.7L V8. I have replaced everything under the hood except the throttle body. I have even replace the IAC valve on the throttle body several times. Every now and then after driving the car on the highway for awhile and then coming into a town with a red light, I sit there waiting for the light to turn green and while waiting there, the tach tends to rev up and down and then the engine stalls. Could this mean that the the throttle body needs to be replaced? It does have 165K miles on it. FYI, I do clean the throttle body regularly. Could the MAF sensor need cleaning?

 

Thank you iroczracer07 , naf , 357 Camaro , Es_91rs
Thanks to everyone who gave me help
It was a problem in the fuel pump
I've replaced the pump, the car is fine now

 

Graig, did you ever get to the bottom of this? I have the same problem on my 92 V8 Firebird

 

Hey GraigMuller. did you ever fine out what was wrong with your 89 IROC-Z . The reason I ask I got a 92 Camaro Z28 5.7 TPI it kinda dose the same thing.