Cylinder 3 very week

jpctln · Nov 27, 2005

Last night the car started feeling like it was running on 7 cylinders so I pulled codes and it said #3 was very weak but not dead. I hooked up a timing light, and the wire was firing and everything, so could this be a fuel injector problem instead of a plug/wire problem? Before I go changing injectors, would fuel injector cleaner help at all? Thanks.

jpctln · Nov 27, 2005

HISSIN50 · Nov 27, 2005

Pull the plug first and swap in a fresh one. Grab a noid light at the parts store, if you dont have one.

Both of these, along with a compression test on that cylinder (done while swapping the plug for convenience), can help narrow it down.

Good luck.

PRO50SC · Nov 27, 2005

jpctln said:
Last night the car started feeling like it was running on 7 cylinders so I pulled codes and it said #3 was very weak but not dead. I hooked up a timing light, and the wire was firing and everything, so could this be a fuel injector problem instead of a plug/wire problem? Before I go changing injectors, would fuel injector cleaner help at all? Thanks.

What car are you working on?

Black1987Stang · Nov 27, 2005

Do a compression test, then add some oil in the cylinder and redo the compression test. If the results become higher your rings are worn, i doubt this though since ive never heard one piston just lose compression one day. Another good trick is to put the piston at top dead center (on compression stroke) or bottom dead center i forget which one but hook up an air line to the cylinder (ur compression tester might have the fitting for this) and pump it up with a pump or just turn on the shop air and if air is coming out the intake then ur intake valve is leaking and if air is leaking out of ur exhaust then ur exhaust valve is leaking. It sounds like a spark or fuel injector problem to me. You can run ur car at night (hood up and idling)to see if that wire has a crack somewhere or if it is arcing off something metal. Also heard u can spray a light mist of water around the wires to see if a spark jumps from the wires. and check the injector with a noid light to see if its firing like Hissin said.

jpctln · Nov 27, 2005

PRO50SC said:
What car are you working on?

vert

jpctln · Nov 27, 2005

Ok thanks guys. Is it safe to drive to school tomorrow?

PRO50SC · Nov 27, 2005

jpctln said:
Last night the car started feeling like it was running on 7 cylinders so I pulled codes and it said #3 was very weak but not dead. I hooked up a timing light, and the wire was firing and everything, so could this be a fuel injector problem instead of a plug/wire problem? Before I go changing injectors, would fuel injector cleaner help at all? Thanks.

Just curious about what you stated. Since when does an ecm give specific cylinder codes on a 93. crapola

TrophyHead · Nov 27, 2005

PRO50SC said:
Just curious about what you stated. Since when does an ecm give specific cylinder codes on a 93. crapola

Cylinder balance test?....I have never tried it though.

Black1987Stang · Nov 27, 2005

TrophyHead said:
Cylinder balance test?....I have never tried it though.

Yup

HISSIN50 · Nov 27, 2005

That is what I inferred as well (that he did the CBT, and the test failed the first or second time, but then passed as the puter rearranged the criteria being used for evaluation).

Cylinder 3 very week

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