89 460 FI Idle issues
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89 460 FI Idle issues
Hello all,
I just bought a 89 F250 with a rebuilt 460. The guy had the motor installed by a factory ford mechanic five years ago and since then as put less than 7,500 miles on it. Here's the problem, the truck runs great going down the highway but it idles a little rough and if I stop at an intersection or something like that it hesitates when you give it throttle and also the exhuast has a very strong smell. I have got a few ideas from some local guys and so far have replaced the fuel pressure regulator, the O2 sensor just upstream of the catalytic converter, throttle postion sensor and the cap and rotor. I also tested the Inlet air bypass vavle and it seems to be working fine. I talked to the guy I bought it from today and he told me the catalytic converter went out one him when he had it so he had a guy gut it out and weld it back together, so I just ordered a replacement. Do you guys think that will help the problem or should I be looking ito something else. Thanks, Chad
I just bought a 89 F250 with a rebuilt 460. The guy had the motor installed by a factory ford mechanic five years ago and since then as put less than 7,500 miles on it. Here's the problem, the truck runs great going down the highway but it idles a little rough and if I stop at an intersection or something like that it hesitates when you give it throttle and also the exhuast has a very strong smell. I have got a few ideas from some local guys and so far have replaced the fuel pressure regulator, the O2 sensor just upstream of the catalytic converter, throttle postion sensor and the cap and rotor. I also tested the Inlet air bypass vavle and it seems to be working fine. I talked to the guy I bought it from today and he told me the catalytic converter went out one him when he had it so he had a guy gut it out and weld it back together, so I just ordered a replacement. Do you guys think that will help the problem or should I be looking ito something else. Thanks, Chad
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M.A.P sensor might be bad,check for a leaking vaccum line going to it or other vaccum leaks,maybe leaking fuel pressure reg, check the coolant sensor,not the temp sensor going to the guage,its the one that feeds info to the ecm
Cargo Master
Joined: Dec 2003
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From: Sunny Florida
It sounds like the truck is running rich and this is what cause the converter to go bad. The MAP sensor should cause the truck to run rich all the time and produce black smoke from that condition.
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Thanks for the suggestion RTM, but the truck doesn't produce black smoke at any RPM. How would I test the MAP sensor. I do have so more possilble clues though, When I went to replaced the HEGO sensor I noticed that the old one wasn't plugged in. Wouldn't that cause a check engine light to come on if everything in the EEC was working the way it should? Also I changed the plugs and wires today and some of them had quite a bit of whiteish(is that a word) junk built up on them. Thanks again for the help, Chad
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From: Idabel, OK
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Cargo Master
Joined: Dec 2003
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From: Sunny Florida
The map will change at idle slightly if you unplug the vac line but to check it correctly you need to know voltage coming at at idle and then apply vacuum to see if if changes.
Not sure on the HEGO sensor. Never had to replace one orseen one bad.
Not sure on the HEGO sensor. Never had to replace one orseen one bad.
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I got my code reader today and these are the codes I got. 33 C EGR valve fault/not closing properly, 67 0 Neutral pressure switch ciruit failure, circuit open, 96 C Fuel pump secondary circuit fault/high speed fuel pump relay open. Does anyone know how I should go about trouble shooting these problems? Thanks Chad
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