Fuel Problem HELP!!!
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
2 5 6 and 7 are a batch.
1 4 5 and 8 make up the other batch.
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Junior User
Joined: Oct 2006
Posts: 82
Likes: 0
From: Fairdale,Ky
My gosh I'm glad you said that! Back in 2009 I was having fits with my truck. I found out that 4 injectors run on one pin of the PCM and the other 4 run on a different pin. I once had a diagram of what each pin was for. I replaced the PCM and it fixed the problem. So tomorrow I will check to see if the wires that go from the PCM to the injectors are okay. Gosh how quick we forgot. I told them order me another one just in case. Thank you for jogging my memory.
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Junior User
Joined: Oct 2006
Posts: 82
Likes: 0
From: Fairdale,Ky
Put anothet PCM in and it's doing the same thing. But that happened the other time I replaced it too. The new PCM was bad. I did notice a ground wire coming from the plug to the fender and another wire coming from there that is not attached to anything. I don't know if that was added or not. Where could it possibly go?
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Put anothet PCM in and it's doing the same thing. But that happened the other time I replaced it too. The new PCM was bad. I did notice a ground wire coming from the plug to the fender and another wire coming from there that is not attached to anything. I don't know if that was added or not. Where could it possibly go?
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Junior User
Joined: Oct 2006
Posts: 82
Likes: 0
From: Fairdale,Ky
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Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
I recall on the 1992 and later trucks there was a ground lead that hooked to the firewall. I'm sure there was a similar setup for 1991 and prior. Cannot give you specifics, sorry.
So two PCMs in a row with only firing 4 injectors makes one think there is a wiring issue between the PCM and the injectors. Mice, rats, squirrels, etc. are known to chew through wires.
So two PCMs in a row with only firing 4 injectors makes one think there is a wiring issue between the PCM and the injectors. Mice, rats, squirrels, etc. are known to chew through wires.
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Junior User
Joined: Oct 2006
Posts: 82
Likes: 0
From: Fairdale,Ky
I tried another PCM and it acted the same. After I had a couple people look at it they both thing it is the Duel Tank Reservoir not letting enough fuel through . I have been hitting the junkyards to no avail. Is there other options? Can I use a single one and forget about the other tank? This is my only vehicle. And I am among the working poor. lol What are my options?
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
I tried another PCM and it acted the same. After I had a couple people look at it they both thing it is the Duel Tank Reservoir not letting enough fuel through . I have been hitting the junkyards to no avail. Is there other options? Can I use a single one and forget about the other tank? This is my only vehicle. And I am among the working poor. lol What are my options?
Instead of trying to empty your wallet, rent a test light to see if all the injectors are being commanded to fire.
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Junior User
Joined: Oct 2006
Posts: 82
Likes: 0
From: Fairdale,Ky
I had not been able until now to check my truck out myself. I had bruised ribs . But checking it out myself, I found the reservoir was leaking. And when I pushed the stem on the fuel rail, it didn't spirt out gas as it should. Which leaves to to think that is the problem.
