Bad Injector Symptoms
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Laughing Gas
Joined: Dec 2005
Posts: 904
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From: Laurel, MS
Bad Injector Symptoms
I recently solved a problem on my truck that I've been trying to figure out for some time.
My truck would run ok on flat ground (i.e. not under load), but under load would lose power and shake. Everything I read seemed to indicate this was a timing issue (pre-ignition or detonation), so I adjusted timing, check plugs and plug wires, etc but never found the problem. I checked the temperature of my header tubes with a digital thermometer and found that #6 was much cooler than the rest. Then I pulled the plug off the #6 injector and the idle didn't change (it did when I pulled the plug on the other injectors). I made sure that the injector plug had power and that the ECU was pulsing ground to it to make the injector fire. Finally, I was convinced that it was the injector, so I changed the injector for #6 and now my truck runs smooth and power is back where it should be.
It took me a while to figure it out, so I thought I'd share in case someone else was chasing a similar issue.
My truck would run ok on flat ground (i.e. not under load), but under load would lose power and shake. Everything I read seemed to indicate this was a timing issue (pre-ignition or detonation), so I adjusted timing, check plugs and plug wires, etc but never found the problem. I checked the temperature of my header tubes with a digital thermometer and found that #6 was much cooler than the rest. Then I pulled the plug off the #6 injector and the idle didn't change (it did when I pulled the plug on the other injectors). I made sure that the injector plug had power and that the ECU was pulsing ground to it to make the injector fire. Finally, I was convinced that it was the injector, so I changed the injector for #6 and now my truck runs smooth and power is back where it should be.
It took me a while to figure it out, so I thought I'd share in case someone else was chasing a similar issue.
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