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Old 07-08-2019, 08:53 AM   #1 (permalink)
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'85 p/u: go/no go/go/no go....

TPS??
starts up, accelerates to a point then it's like fuel is not being delivered once hitting around 1800 rpm or so. fueling/accel lasts longer in higher gears. will keep fueling at lower rpms, sort of lugging the engine, but once it gets going then rpms drop, then surge, then drop, surge, etc...
I'm thinking TPS but wondering if there's something else I should be thinking about b4 diving into it?
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Old 07-08-2019, 09:19 AM   #2 (permalink)
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Fuel filter
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Old 07-08-2019, 05:33 PM   #3 (permalink)
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Check the sock out on the end of the pump in the tank .
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Old 07-09-2019, 04:26 PM   #4 (permalink)
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Quote:
Originally Posted by venison View Post
TPS??
starts up, accelerates to a point then it's like fuel is not being delivered once hitting around 1800 rpm or so. fueling/accel lasts longer in higher gears. will keep fueling at lower rpms, sort of lugging the engine, but once it gets going then rpms drop, then surge, then drop, surge, etc...
I'm thinking TPS but wondering if there's something else I should be thinking about b4 diving into it?
FSM. Get one. It will tell you step by step what to check instead of guessing and wasting money on parts.
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Old 07-10-2019, 08:43 AM   #5 (permalink)
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I've read the EFI diagnostics in the FSM. I've also dealt with all kinds of fuel obstructions in diesels, which is what I work on mostly... I just don't know the 22re real well. I suppose it's possible, but I think if I could describe the symptoms better it would make sense that it's not some sort of filter/physical obstruction. It starts and idles normally. When accelerating, it has full fueling, to a point, and then it's cut off almost completely (but not to stall), then there's a delay of a few seconds, and then it has full fuel again, and then it's cut... This pattern repeats itself regularly seemingly relative to rpm, load on the engine (fuels longer when it's lugging) and/or what other factors I'm not sure, but it's not acting like any fuel starvation issue I've ever encountered before. Despite what the FSM says, I think it's likely something about how the EFI is controlled. The ECU has several inputs (FSM: EFI System/FI-18, bottom of page). Just thought maybe if someone else had experienced similar symptoms it might help me to narrow down the possibilities.
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Old 07-10-2019, 09:43 AM   #6 (permalink)
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It only takes a few minutes to check the TPS with a multimeter and feeler gauge.

If your TPS checks out, then check the timing.
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Old 07-11-2019, 06:21 PM   #7 (permalink)
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I had a Camaro that did the exact same thing. Found low fuel pressure, but not by much. After the fuel filter I went for the fuel pump (big job on a 3rd gen Camaro). Inside the fuel tank a 6 inch long piece of fuel line had cracked between the pump and tube going out of the tank. Spent too much money and WAY to much time on a 25 problem.
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