Wits End!
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Wits End!
I have a 1996 F250 with 460 V8 EFI...new PCM, New Oxygen sensor good battery cables...all to the tune of many hundreds of dollars to get the thing started after towing it in.
Ran fine from the dealer the afternoon I bailed it out.
Sat in my driveway overnight...won't start...just like before all the diagnostics and expenditure and new electronics.
It's hot weather, the truck has 219,000 miles, no catalytic converter and it's damned close to getting traded off.
I have no diagnostic tools... so I'm at a loss.
Question 1: Will a malfunctioning Idle Air Control valve prevent starting?
Question 2: Where do I start looking since two different Ford Dealers have jacked with this thing and it's still not dependable (which it has been up until the past two weeks.)???
Help.
Dan
Ran fine from the dealer the afternoon I bailed it out.
Sat in my driveway overnight...won't start...just like before all the diagnostics and expenditure and new electronics.
It's hot weather, the truck has 219,000 miles, no catalytic converter and it's damned close to getting traded off.
I have no diagnostic tools... so I'm at a loss.
Question 1: Will a malfunctioning Idle Air Control valve prevent starting?
Question 2: Where do I start looking since two different Ford Dealers have jacked with this thing and it's still not dependable (which it has been up until the past two weeks.)???
Help.
Dan
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by dcrummett
Question 1: Will a malfunctioning Idle Air Control valve prevent starting?
Originally Posted by dcrummett
Question 2: Where do I start looking since two different Ford Dealers have jacked with this thing and it's still not dependable (which it has been up until the past two weeks.)???
If you do have a OBD I (some 460's over ??? GWV still with OBD I in 96) then you can run a self-test to get them.
When you say, "...won't start..." what is happening?
Will crank?
Or just crank and not start?
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Thanks for taking this on guys!
The 460 cranks like a sewing machine, but won't light off.
Over the past 6 months I've had problems with occasional cranking and no start and some dying at stop signs with hard restarts... went camping last weekend, dropped the RV and parked the Ford...that was it. Had it towed to a Ford dealer, where they found the previous owner had a Superchip in it and an O2 sensor that was dead (and the wrong one for this application). Replaced O2 sensor, cleaned throttle body, checked battery cables, it ran and died in the shop, they checked further and traced it back to the PCM (replaced). They ran it, did diagnostics, test drove it and I picked it up. It ran fine, pulled the RV and the race boat back home, dropped everything...next morning cranks but no start.
AT one point I thought I had a front fuel pump failing (still may) but I know the back fuel pump is good (replaced it myself about a year ago) and the problem exists regardless of which pump is selected.
Thanks.
Dan
The 460 cranks like a sewing machine, but won't light off.
Over the past 6 months I've had problems with occasional cranking and no start and some dying at stop signs with hard restarts... went camping last weekend, dropped the RV and parked the Ford...that was it. Had it towed to a Ford dealer, where they found the previous owner had a Superchip in it and an O2 sensor that was dead (and the wrong one for this application). Replaced O2 sensor, cleaned throttle body, checked battery cables, it ran and died in the shop, they checked further and traced it back to the PCM (replaced). They ran it, did diagnostics, test drove it and I picked it up. It ran fine, pulled the RV and the race boat back home, dropped everything...next morning cranks but no start.
AT one point I thought I had a front fuel pump failing (still may) but I know the back fuel pump is good (replaced it myself about a year ago) and the problem exists regardless of which pump is selected.
Thanks.
Dan
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It must be heat related!
It must be the heat. The truck had been sitting in the sun (and it's 104 here yesterday). I went out this morning and it fired off with no problem.
What in the system is heat sensitive?
Dan
What in the system is heat sensitive?
Dan
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by dcrummett
It must be the heat. The truck had been sitting in the sun (and it's 104 here yesterday). I went out this morning and it fired off with no problem.
What in the system is heat sensitive?
Dan
What in the system is heat sensitive?
Dan
Second guess would be a bad Ignition Control Module (ICM).
Third would be a bad Ignition Coil.
The PCM was more than likely a good one that was changed out.
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Mountain Pass
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Test your engine coolant sensor. It is the sensor that the ECM relies on until the engine heats up enough to swap over to the O2 sensors. If it is telling the ECM that the engine is too cold then it will flood the engine with fuelNo start) or vice versa if it says its too hot it will starve the engine of fuel(Again no start). Go to fordfuelinjection.com for the specs on the sensor, as I cant remember what they are off the top of my head.
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Thanks all of you...I'll do some checking on this thing along those lines.
BTW: The fuel pumps do come and prime for about a second or so before pressuring up... so that's good.
The ignition module was something I suspected early on (and mentioned to the Ford folks)... Will check the coolant sensor too...when I get time.
Thanks again for the help.
Dan
BTW: The fuel pumps do come and prime for about a second or so before pressuring up... so that's good.
The ignition module was something I suspected early on (and mentioned to the Ford folks)... Will check the coolant sensor too...when I get time.
Thanks again for the help.
Dan
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From: savannah,ga
need to start with simple test first
when you get a no start issue pull the coil wire and turn over to check for spark
if no spark then begin test on electronics
if you have spark then test for fuel pressure
a simple tire gauge will tell if you have proper amounts
keep us informed as you test for other ideas
when you get a no start issue pull the coil wire and turn over to check for spark
if no spark then begin test on electronics
if you have spark then test for fuel pressure
a simple tire gauge will tell if you have proper amounts
keep us informed as you test for other ideas