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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 04-17-2010, 04:34 PM
chas87f150 chas87f150 is offline
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87 f150 302 engine won't idle.

my 87 f150 with the 302ci engine won't idle. Runs OK at 800-1000 rpms but the moment I let off on the gas peddle it dies immediately. Have new fuel pumps (in tank pumps and hi pressure). Any ideas?
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Old 04-17-2010, 05:45 PM
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Did you change the fuel filter when you changed the pumps? Also check the regulator by pulling the vacuum hose off of it. If any gas drips out of it the regulator is bad.
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Old 04-18-2010, 07:15 PM
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Quote:
Originally Posted by DBGrif91 View Post
Did you change the fuel filter when you changed the pumps? Also check the regulator by pulling the vacuum hose off of it. If any gas drips out of it the regulator is bad.
Thanks DBGrif91 - I did change the filter but did not check the regulator. I will do that this evening and let you know.
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Old 04-18-2010, 08:05 PM
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Is there pressure at the rails? Pressure at the schrader valve?
Can you hear the pumps priming?

These trucks were prone to electrical issues.
Fuel pump relay
Fuel pump regulator
TPS
Even bad replacement fuel pumps.
Injectors

Check to make sure you have fuel at the rails.
Good low pressure fuel pumps are a must.

If everything is good, check emissions and computer.
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Old 04-19-2010, 02:23 AM
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I would suspect its the IAC.
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Old 04-20-2010, 09:08 PM
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DARREN: Thanks for the help. There is pressure at the schrader valve on the fuel rail - it shoots up about 2-3 inches so it seems adequate. Strangely enough i went to buy a fuel pressure tester and the only one that came with a schrader valve adapter listed all the makes and models of vehicles the tester supported and no F150s were listed??? The parts guy didn't have a clue as to why so I didn't buy it. Any ideas on this? Yes the pumps prime - I can hear them and I replaced them just last fall. Both in tank pumps (I have dual tanks as well as the in-line hi-pressure pump.) As far as the fuel pressure regulator and TPS - my manuals say they can be cleaned up a bit and reinstalled. I have tried this - but no change. When you say emmisions - what specifically are your thinking of?
TEXASGUY: Thanks for the IAC thought. My manual says to run on idle without any assisted gas and unplug the IAC (IAB) and unpluging it at idle. If the engine begins to run rough or stalls then the IAC/IAB is possibly bad. However my problem is that I cannot idle the engine. The moment I let of on th gas peddle the engine dies immediately. So I have a bit of a problem trying this test. Any ideas on this. I hate to just go out an buy new parts and hope they fix the problem. I prefer to test them if possible, but in this case I may have to just buy a new IAC?
Thanks Guys!
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Old 04-23-2010, 08:45 AM
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The IAC can be cleaned as well. If you have a manual then it should explain the procedure for it.
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Old 04-23-2010, 08:45 AM
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