idle surge
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idle surge
I just installed a new motor/trans on a 94 f350 460 and I am having problems with an idle surge(about 600-800), at first I thought it was a coolant temp sen. but that didn't help, also replaced the iat, cleaned the iac, there are no vacuum leaks(check with propane), the egr is functioning, timing is set at 10 btdc all new ignition except for distributor, fuel filter, new adj. regulator. Any help is much appriciated.
thanks
Justin
thanks
Justin
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I replaced the injectors with accel 24#'s that I had for another vehicle, firing order is correct, the idle still surges and stays high for a minute after driving then drops. When it is cold, the idle is rough and gets a little better after warming up
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HEGO (heated exhaust gas oxygen) Sensor http://www.ngkspark.com.au/tech_inde...sors_index.htm
What temperature size of thermostat did you install, make sure it's the correct temperature size for your engine to run correctly.
Check injectors with a stetoscope, or some other type of listening device, make sure that all injectors are opening, or clicking.
Recheck your vacuum and verify that all vacuum was installed as per vacuum schematics for your engine. Check for vacuum leaks.
Verify you don't have a bad spark plug wire or spark plug.
http://groups.google.com/group/rec.a...20202abb675b07
Check the condition of you catalytic converter for restrictions.
What temperature size of thermostat did you install, make sure it's the correct temperature size for your engine to run correctly.
Check injectors with a stetoscope, or some other type of listening device, make sure that all injectors are opening, or clicking.
Recheck your vacuum and verify that all vacuum was installed as per vacuum schematics for your engine. Check for vacuum leaks.
Verify you don't have a bad spark plug wire or spark plug.
http://groups.google.com/group/rec.a...20202abb675b07
Check the condition of you catalytic converter for restrictions.
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I replace the hego sensor with a new one(not a universal)
therostat I have tried a 195 and 180, no differance
injectors where all flow tested, and all are working
all sparkplugs look great, there are no ignition misses
vacuum lines have been checked at least 5 times and can't find any leaks
the idle I set according to the directions on the iac spacer(.002 then 1/2 turn)
and I check the cat before installing the headers
the idle jumping up and down haas pretty much gone away with the spacer for the iac, now it runs rough when cold and the idle stays high for a minute after driving and putting it back into park from gear.
therostat I have tried a 195 and 180, no differance
injectors where all flow tested, and all are working
all sparkplugs look great, there are no ignition misses
vacuum lines have been checked at least 5 times and can't find any leaks
the idle I set according to the directions on the iac spacer(.002 then 1/2 turn)
and I check the cat before installing the headers
the idle jumping up and down haas pretty much gone away with the spacer for the iac, now it runs rough when cold and the idle stays high for a minute after driving and putting it back into park from gear.
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there is only the main ground on the block from the battery and one on the back of pass. side head. also I have cleaned the connections with contact cleaner, the only one I couldn't get apart was the main harness on the driverside fenderthat goes to the engine