• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Running rough

Easter

Easter

Member
95 camaro 3.4 v6. Idles smooth. Drives rough. Idles high after warm up. New plugs and wires last year. Only drove during summer. Any ideas out there.
 
No check engine light not on. I put new set of plugs in. Runs a lot better but still a little jumpie. Wires new too. Also, sometimes when I go to start it, it turns over like three times, then everything gets real quite for couple seconds, then starts. New starter last year.
 
I'm guessing something with an idle air controller, air flow sensor, or throttle sensor, but honestly could be any sensor that manages air/fuel control.

Could possibly diagnose by getting a datalogger which probably will require a cord of some sort and a laptop and some software. Sometimes the software is free, sometimes it's not. Track your sensors, o2 readings, timing, etc and see what looks wrong.
 
deadlyapp said:
I'm guessing something with an idle air controller, air flow sensor, or throttle sensor, but honestly could be any sensor that manages air/fuel control.

Could possibly diagnose by getting a datalogger which probably will require a cord of some sort and a laptop and some software. Sometimes the software is free, sometimes it's not. Track your sensors, o2 readings, timing, etc and see what looks wrong.
Click to expand...
 
I'd bet on leaking manifold gaskets. The 3.4 is notorious for them, and the problem is especially bad when the engine is cold. It can cause coolant loss, high idle, and misfire.
 
Sorry I missed that. It would be the intake manifold. You can find a lot of examples on Youtube, both failures, and repairs.
 
Well I pulled lower intake and saw no evidence of a leak. So I still don't know why it's running rough. Have to pull rocker arm and rods to in stall gaskets. I read you have to get top dead center then start adjusting rods. But I read someone said you don't have to do that. He said just look at it and adjust the ones that the lifters are down then turn crank until others go down and adjust as they go down. His way would be easier but will it be right. Thanks for the imput.
 
Easter said:
Well I pulled lower intake and saw no evidence of a leak. So I still don't know why it's running rough. Have to pull rocker arm and rods to in stall gaskets. I read you have to get top dead center then start adjusting rods. But I read someone said you don't have to do that. He said just look at it and adjust the ones that the lifters are down then turn crank until others go down and adjust as they go down. His way would be easier but will it be right. Thanks for the imput.
Click to expand...

TDC will occur at six different positions as you rotate the crank once. Each set of valves will close and open once every TWO crank revolutions. Sounds like this mystery guy IS moving the engine to each TDC for pushrod adjustment. Usually pushrods are adjusted at TDC of the compression stroke so that you can adjust the open gap of the rocker-camshaft interface.
 
JCH13 said:
TDC will occur at six different positions as you rotate the crank once. Each set of valves will close and open once every TWO crank revolutions. Sounds like this mystery guy IS moving the engine to each TDC for pushrod adjustment. Usually pushrods are adjusted at TDC of the compression stroke so that you can adjust the open gap of the rocker-camshaft interface.
Click to expand...
JCH13 said:
TDC will occur at six different positions as you rotate the crank once. Each set of valves will close and open once every TWO crank revolutions. Sounds like this mystery guy IS moving the engine to each TDC for pushrod adjustment. Usually pushrods are adjusted at TDC of the compression stroke so that you can adjust the open gap of the rocker-camshaft interface.
Click to expand...
 
K, I'm having trouble finding out which cylinder is number one. Most things I've seen day first cylinder on passenger side. But i be seen some say first cylinder on drivers side. Anyone know for sure. Wanna get it right.
 
This says for 1994 .. but should be the same for the 1995 ... If your car is rear wheel drive Cylinder 1 is Passenger Side Front .. so it goes "1,3,5" ... If it is Front Wheel Drive then the Odd Numbers are by the Firewall ... in either case, Cylinder #1 is closest to the Crankshaft Pulley

2006-08-14_123113_ja1.JPG
 
bruceb said:
This says for 1994 .. but should be the same for the 1995 ... If your car is rear wheel drive Cylinder 1 is Passenger Side Front .. so it goes "1,3,5" ... If it is Front Wheel Drive then the Odd Numbers are by the Firewall ... in either case, Cylinder #1 is closest to the Crankshaft Pulley

2006-08-14_123113_ja1.JPG
Click to expand...
 
bruceb said:
This says for 1994 .. but should be the same for the 1995 ... If your car is rear wheel drive Cylinder 1 is Passenger Side Front .. so it goes "1,3,5" ... If it is Front Wheel Drive then the Odd Numbers are by the Firewall ... in either case, Cylinder #1 is closest to the Crankshaft Pulley

2006-08-14_123113_ja1.JPG
Click to expand...
 
Ok i think I got it at Tdc but want to check before I go further. They say you can adjust certain valves in this position. Do you have diagram with valves numbered so I can check and make sure the right ones are in the right position. Thanks.
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top