Any quick & easy Fuel Injector test??
Thread Starter
Melting Slicks
Joined: May 2000
Posts: 2,974
Likes: 5
From: CenTex Texas
Any quick & easy Fuel Injector test??
Is there any quick and easy way to test a fuel injector? I'm thinking one mybe clogged because i've slowly started getting multiple misfires on cylinder #5 only. It started with a few hundred misfires (within a few minutes) a couple of days ago but has now increased to over 2000 misfires (within a few minutes) today. The MIL light is on and the only code i get is P0300.
I've checked and replaced all plugs and wires, cleared all codes and turned off MIL. But the P0300 code quickly came back and so did the MIL light...and i'm still getting over 2000 misfires. Any ideas?
I've checked and replaced all plugs and wires, cleared all codes and turned off MIL. But the P0300 code quickly came back and so did the MIL light...and i'm still getting over 2000 misfires. Any ideas?
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
You can also unfasten the fuel rail assembly and raise it up slightly just enough to get clean rags underneath each injector. Energize system and look for results.
HTH
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
BTW, I can't take credit for it. It is a method (among others) suggested in the shop manual IIRC when diagnosing suspected fuel system problems. Using a NOID light is another, but that only shows that the suspect injector is triggering; not if it's actually passing fuel through it.
Keep us posted.
Burning Brakes
Joined: May 2002
Posts: 831
Likes: 0
From: Albuquerque NM
Sorry to bring back an old post, but my dads '98 is getting the same P0300 code and he's not exactly up on computerized cars. I'm going to try swapping the coil packs as mentioned above and see if that changes anything. He just got a fresh tank of Chevron 91 and added a full bottle of techron to it, he usually buys chevron, but it's the 86
and very rarely drives it (Like 10k miles in the past 8 years), so I'm leaning more towards a clogged injector than anything else.
and very rarely drives it (Like 10k miles in the past 8 years), so I'm leaning more towards a clogged injector than anything else.
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Team Owner
Joined: Mar 1999
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From: At the beach in little Rhody
C4's were notorious for injector problems, and using cleaners made it worse as it dissolved the insulation on the coil. A balance test will let you know which one it is, but you need a tool to fire the injectors individually. C4 is also batch fire.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Wire resistance for C5 OEM wires is 250-750 ohms.
Check for proper compression. You could also have a bad valve spring.
You can use a mechanics stethoscope and listen to each injector fire Electrically/Mechanically They will make a clicking noise when they fire. They should all sound the same if there operating correctly. You can use a dwell meter to see if there firing electrically
BC
Check for proper compression. You could also have a bad valve spring.
You can use a mechanics stethoscope and listen to each injector fire Electrically/Mechanically They will make a clicking noise when they fire. They should all sound the same if there operating correctly. You can use a dwell meter to see if there firing electrically
BC
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
