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Old 07-11-2020, 08:27 PM   #1
John Jenkins
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Default Truck cranks and idles fine, won't rev past 1,300

Hi folks. I'm new to the board and I have a problem with my 1995 D21 with a KA/5-speed. The truck has about 190K on the clock. For a while, the check engine light was on (although the truck ran great) so a couple of months back, I replaced the MAF, TPS and the little sensor in the airbox. Truck quit throwing codes, CEL went off and things have been great for a few months. Now the starts right up and idles fine, but won't rev past about 1,300 with out stalling. CEL is still off and it's throwing no codes. I tested all the new components anyway and they check out fine. Pulled the EGR, cleaned and tested it, no problems so I reinstalled with a new gasket. Found a couple of vacuum leaks (rotted lines) and fixed those. The biggest one was on the big line on the little modulator above the EGR. I've tested all applicable relays, no trouble there. I've also changed the fuel filter. The tach also jumps around, but it's been doing that for a couple years now and it ran fine.



Has anyone here had similar trouble? Where should I look next?
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Old 07-11-2020, 08:51 PM   #2
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Have you tested the fuel pressure?
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Old 07-11-2020, 08:54 PM   #3
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Funny you mention that, I was about to run out and grab a gauge. Test between filter (since it's brand new) and injectors?
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Old 07-11-2020, 09:01 PM   #4
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Yeah, you check between the filter and the fuel rail.
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Old 07-11-2020, 10:20 PM   #5
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Fuel pressure is 40 psi at the filter outlet.
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Old 07-11-2020, 11:07 PM   #6
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Just asking for my edumacation, when doing a fuel pressure check, is it done while idling? Revving? Or just "ignition 'on'"? I noticed last week that it appeared a member did a permanent install of an inline gauge? Will that last?


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Old 07-11-2020, 11:12 PM   #7
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Okay, so I let it sit for a few and tested it again. At idle Iíve got about 33.5 psi and then when I remove the vacuum line going to the FPR, it jumps to about 43.5. Iím doing all my testing at idle. If I grab the throttle linkage and try to rev the engine, it dies at around 1,300 rpm unless I back off the throttle.
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Old 07-12-2020, 02:03 AM   #8
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Quote:
Originally Posted by nunya View Post
Just asking for my edumacation, when doing a fuel pressure check, is it done while idling? Revving? Or just "ignition 'on'"? I noticed last week that it appeared a member did a permanent install of an inline gauge? Will that last?
I installed a fuel pressure gauge when i carbed mine. I used a fluid filled gauge and it screwed directly to the pressure regulator. No problems at all.
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Old 07-12-2020, 03:10 AM   #9
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Fuel pressure when running should stay the same whether it is "ignition ON", "idling" or "revving". That fuel pump is badass! When it is Off, the fuel pressure drops down to 30ish.

> Truck quit throwing codes, CEL went off and things have been great for a few months.

When you say it stopped throwing codes, does that mean your CEL isn't turning ON anymore or that you tried pulling the codes and you got 55? Only emissions codes turn on the CEL. The link in my signature goes over how to pull the codes.
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Old 07-12-2020, 04:01 PM   #10
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Quote:
Originally Posted by jp2code View Post
Fuel pressure when running should stay the same whether it is "ignition ON", "idling" or "revving". That fuel pump is badass! When it is Off, the fuel pressure drops down to 30ish.

> Truck quit throwing codes, CEL went off and things have been great for a few months.

When you say it stopped throwing codes, does that mean your CEL isn't turning ON anymore or that you tried pulling the codes and you got 55? Only emissions codes turn on the CEL. The link in my signature goes over how to pull the codes.

CEL comes on with ignition switch on, then goes off when cranked like it's always done. I get the 55 code, ECU lights go out then nothing else. I then turn the screw to the "run" position and it purrs like a kitten. Try to rev and it stumbles badly right at 1,300. It also idles fine when the screw is in the "test position". I'll go through your code procedure to see if it'll do anything else and report back.

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