76 280z electrical problem

[rzkas]

HI? my car starts up just fine and idle in park and nuetral gear just fine without i pressing on the gas. But when i press on the gas when it get to a certain point the engine shakes. the shaking also occur whe it in drive or reverse position and even when am test driving the car i feel the engine shake. with my foot on the brakes and car in reverse or driving gear, engine still shakes.

i changed my spark plugs and spark plugs wire but did not change the distributor cap and rotor. i dont know what is going on?

maybe i must have screwed up with my firing other or what.

pls what is going on with my car and what is the firing order from the distributor to the engine. distributor firing order picture will be very helpful to me, so i can trace each cable from the distributor to the the correct spark plug.

When i drive the car or just rev it in driving gear or in park/neutral gear at certain point it backfires like pop pop.

help me pls and thanks for you help.

[FastWoman]

When you open the throttle very slightly, the throttle position sensor (TPS) signals the computer, and the idle enrichment is dropped. It might be that your engine is running too lean, and when you come off idle, it runs much too lean.

When you say "backfires," do you mean a true backfire out the intake, or do you mean an afterfire out the exhaust? Backfire suggests lean running. Afterfire suggests rich running.

What do your plugs look like?

[rzkas]

after fire out the exhaust and back fires out the intake. i will say after fire and back fires. it does both.

[Zed Head]

Regarding your firing order:

I found this page - http://i26.photobucket.com/albums/c140/mwh5150/Firing-order.jpg

in this thread on another forum - http://www.zdriver.com/forum/showthread.php?t=17728

It's the same for all L6's. In your case, I would pick one plug and go around from there, rather than removing them all and restarting. Just to be sure that you don't get them in the right order but off by one spot.

If it runs now, you might find two wires switched.

Edited March 4, 2011 by Zed Head