EFI 460 doing something wierd...HELP!
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Senior User
Joined: Aug 2007
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From: NVA
EFI 460 doing something wierd...HELP!
I posted this over in the 87-96 truck forum, but thought I might be able to get some expertise here as well.
took the truck out yesterday and it started doing something strange I have never felt before...going down the road with steady throttle it just "skipped" a couple fires, maybe for a half second. No exhaust noise, oil and voltage read steady, then it ran fine until the next time it did this. I turned around about two miles from the house because it kept doing this. It stalled at a red light, but fired right up and did this the whole way home. All speeds I drove 25-55mph.
Now I have been working on this basket case for a couple months, so I've gone through all the codes and sensor fun trying to chase down the idle (which has gotten better but still leaves much to be desired). I really have no clue where to start trying to diagnose this one, so any help would be greatly appreciated.
Thanks!
took the truck out yesterday and it started doing something strange I have never felt before...going down the road with steady throttle it just "skipped" a couple fires, maybe for a half second. No exhaust noise, oil and voltage read steady, then it ran fine until the next time it did this. I turned around about two miles from the house because it kept doing this. It stalled at a red light, but fired right up and did this the whole way home. All speeds I drove 25-55mph.
Now I have been working on this basket case for a couple months, so I've gone through all the codes and sensor fun trying to chase down the idle (which has gotten better but still leaves much to be desired). I really have no clue where to start trying to diagnose this one, so any help would be greatly appreciated.
Thanks!
Junior User
Joined: Dec 2007
Posts: 89
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Need more info. what have you replaced...any current codes? Have you checked your coil for resistance, wires, plugs etc? Fuel pressure staying the same....compression check will tell you if you are having any internal problems...more than likely not, but wouldnt hurt..Dirty injectors? let us know
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Senior User
Joined: Aug 2007
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From: NVA
It was showing codes 98 (hard fault present) and 22 (MAP sensor), which I had already replaced. Based on some tips from the crew on the other forum I found that there is something wrong in the harness going up to the MAP sensor. I attached the old one, but did not mount it to the firewall so the wires going to it are at an odd angle...both the 98 and 22 cleared immediately and the problem stopped.
Thanks for your help, I still have many more issues to sort out on this 460.
Thanks for your help, I still have many more issues to sort out on this 460.
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JohnnyAirtime
Excursion - King of SUVs
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Jan 4, 2010 01:47 PM
