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#1 |
Senior Member
Join Date: May 2010
Location: Holland Mi
Posts: 649
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Old Rusty, as my wife calls it, is my plow truck here in Mi. Runs good for a 400 $ truck, except when it warms up. Its wierd, sometimes, not always, has a big bog when stepping on the gas, then quits, starts right back up and runs good for a minute or two, then does it again. I changed the in tank fuel pump, air valve for the intake, plugs, wires. It's a 2300 4cyl. any thoughts?
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#2 |
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Join Date: Jun 2010
Location: Detroit suburb, MI
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Have you ever replaced the fuel filter ? Coud be the problem.
Sal |
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#3 |
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Location: Holland Mi
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#4 | |
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Join Date: Jun 2010
Location: Detroit suburb, MI
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Have you checked the fuel pressure when this happens ? If I remember right it should be 32 PSI with the vacuum line on the regulator at idle, and 40 PSI with the vacuum line disconnected at the regulator (simulating wide open throttle). Maybe scan the procesor for trouble codes too. Sal |
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#5 | |
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AIR VALVE (?)
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#6 |
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Location: Holland Mi
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#7 |
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Clean the throttle body if you haven't already.
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#8 |
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Location: Holland Mi
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thanks guys for the help
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#9 |
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It sounds to me ...
![]() I am a$$-u-me(ing) it is an EFI SYSTEM with a SGL THROAT THROTTLE BODY. It is EEC-IV OBD-II. The ECM needs to be scanned for any possible code(s). Did you have a fuel pressure gauge when replacing the pump? It idles fine at cold start but when the fast idle comes down she stutters? Is the throttle body carboned up? There is also an IAC (IDLE AIR CONTROL) MOTOR on the side of the TB that will get gummed up as the PCV SYSTEM unloads there. Then you also have a COOLANT TEMP SENSOR that goes because the coolant is never changed and an AIR INLET TEMP SENSOR. You can scan the ECM manually if you have the patience.
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#10 | |
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![]() OBD-I dumba$$ ... ![]() Getting hard to find qualified help ... The only thing I know is to scan the ECM. At least that should give you some indication as to where to start. I have an early scanner but it hasn't seen day-lite for twenty years (similar to my sex life). FORD SERVICE LITERATURE is $$$, even used. I don't know if a HAYNES MANUAL would help you through diagnostics. Being off-road and if near a salvage yard, you could convert it back to carb. Maybe browse through this site - https://www.therangerstation.com/ I am still trying to figure out why for the offset IAC. Must have been in the drunk tank during that period ...
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#11 | |
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#12 |
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I don't have the design progress sequence for light truck.
Pre-1988 may be a throttle body (CFI/TBI) or possibly a feedback carb. I don't know off-hand how far you would have to go back for true carbureted fuel and ignition. Have you thought of trying to pull codes with that other page I posted? |
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#13 |
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now you have overloaded me with info. Thanks I will see what i can figure out. On this one the idle air control is by the air cleaner, and i replaced that, seemed to help for a week or so then back to the same thing. I guess i should drive it more, but its not road worthy and it hardly snows here any more. ha ha
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#14 |
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Join Date: May 2010
Location: Granite City, Illinois
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If I'm not mistaken, '88 was the last year for carburators before EFI took over in '89. Sounds to me like junk in the gas tank is bunching up around the sock and starving out the carb for gas, but once it is shut off, there's no more suction and the junk falls off around the sock, so the engine can start again, for a little while until the situation repeats itself. Either that or clogged fuel filter.
For refernece, I use those cheap clear-plastic inline fuel filters in both my jalopies and they never last longer than one year, even though I don't run them much anymore. |
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#15 | |
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#16 |
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It is EFI, correct? This year had two pumps, one a transfer pump in the tank and the other, the high pressure pump on the rail.
Could also be a vacuum leak, EGR VALVE or possibly a fuel pressure regulator. You actually need a FORD WSM to go through the DIAGNOSTIC ROUTINE before dumping any more $$$ on it.
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#17 | |
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![]() Quote:
This one is a 2.3L EFI, and yes the IAC was mounted to the air cleaner box with a hose going to the throttle body. Sal |
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#18 |
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Location: Holland Mi
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#19 |
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If it is an '88, 2.3 it's a DOHC engine with a plastic intake manifold. The manifolds did crack, creating a vac leak, that usually won't throw trouble code. Sometimes you can find a vac leak with carb cleaner spray, just stay clear of the ignition system
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#20 |
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Join Date: May 2010
Location: Holland Mi
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Yes, thats the one. when i mess with the IAC hose by taking it partial off the thing runs nice. thats why i replaced the IAC. but that was not the permanent fix, but makes me think i am on the right track.
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