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Old 03-22-2019, 12:41 AM   #1
CameronLarsen21
 
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Default Refuses to accelerate past certain RPM, engine bucks...?

Hey guys,
I've had some super great problems with my 1987 Z24i D21 recently. Its a 5-Speed Manual, and its been to hell and back. But it works. Its my first car (one that I own and paid for myself), and its my first manual as well. I can't ever go back to an automatic anymore. Manuals are just too much fun
About two weeks ago, it worked perfect. The gas mileage was about 8 MPG, and that was the only issue. Then it started to have this really unusual problem.
In every gear, and even when in neutral, if the engine is revved past a certain RPM, the engine starts to lurch and buck, never climbing past this RPM. When in gear, it causes the entire car to buck. When in neutral, you can just hear the RPM climbing and falling, about three times a second, never going past that certain RPM. This causes me not to be able to go above 65 or so (No freeway for me), and it causes me to accelerate very slowly. I have no clue what the RPM is, as the truck came stock without a tachometer, so I play it by ear.
Also, around the same time, something else happened (and has happened four times since then). Im driving normally, and then the car looses all power and turns off. The electricity is fine, it looses no electric power. The starter is new as of about a month ago. The transmission is rebuilt and pretty much new.

Im not sure if the horrific gas mileage, the sudden engine shutdown, and the engine bucking is connected, or if I have a few problems, but anything will help.
Sorry for the monologue, and thank you for any help and/or advice.
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Old 03-22-2019, 01:14 AM   #2
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It sounds like you may have a combination of problems. My first thought when the fuel economy is low is that the timing may be set incorrectly. On the 86.5 the timing should be set to 5 degrees btdc. I would guess the 87 is the same.

The surging idle could be a vacuum leak. If that’s the case you may be able to track it down by spraying around all the gasket surfaces with carburetor cleaner.

You should also check the ECM for any stored codes. They may give you some places to look at as well.
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Old 03-22-2019, 01:18 AM   #3
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The RPM limit is likely limp mode.



Check timing.



SiFi can get you a PDF of the FSM and JP has the ECM fault code list I made.
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Old 03-22-2019, 01:54 AM   #4
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Maybe these will be clear enough to read



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Old 03-22-2019, 03:14 AM   #5
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How about the fuel filter.
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Old 03-22-2019, 06:55 PM   #6
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Hi Cameron,
I have an 86 and had the EXACT same symptoms you describe in your OP. I was getting a code(I think 43) for injector failure from my ECM.

The problem on my truck was the wiring to the injectors was corroded at the crimp where it separates from 1 wire to the 2 to feed the injectors.
I split the harness from the firewall out and went to digging for the wires.
Once I found them this is what they looked like:



The wire had two brass crimps within about 16 inches of each other, and they were totally corroded. I cut the wire, stripped back to reveal clean copper and soldered them and then heatshrink. All junctions that I found in the engine bay were done this way.
Problem solved! Codes never came back, and truck will rev as normal. They were not hard to find, just time consuming to get cleaned up and rewrapped.
Totally worth it.
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