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Old 03-03-2021, 04:10 AM   #11
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Have you pulled the injector harnesses to check the resistance on each of the injector's coils?

Specs are 10 - 14 ohms at 77*F for a 1996 HB model.

It's a quick determination if the coil(s) are good on each injector. Just put the 2 DMM meter leads across the terminal pins and read the Ohm's. At least with this test. You can potentially eliminate a bad coil(s). Are these original injectors? Hitachi? Aftermarket? Sticking injector needle? Coil giving high resistance at 3500 rpm?

How about a fuel pressure test? All Grounding points clean and tight? I would check for continuity at ALL connectors/connections. These are points of looseness, bad crimps, corrosion etc.

I would also perform continuity tests from the ECM's harness, when disconnected, to the injector's harness connector. Set your meter to "tone". So that you can hear the "beeeeeeep", if continuity is achieved. Factory Manual on page EC(Engine Control)-280 shows that Pin 102 is Injector #1, Pin 107 is Injector #2, Pin 104 is Injector #3 and Pin 109 is injector #4. Check for continuity AND power to the injector's harness. Should show battery voltage at 12VDC -14VDC.

You can even use a screwdriver to listen to the "taps" of the injector needle when the coil is energizing and deenergizing. I use a mechanic's stethoscope to help listen to specific places on a component for testing.

These tests will hopefully eliminate key elements that may have been overlooked or worse. Never checked. Devil's in the details. Proceed with a fine tooth comb. If not, you will be chasing this problem and a turbo engine may never happen.

Just some thoughts to consider...
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Old 03-03-2021, 05:33 AM   #12
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Quote:
Originally Posted by jp2code View Post
Likely an injector and exhaust manifold leak.

Also sounds like you need to do the timing chain and guides. That will cause the lifter noise.
Already did the timing chain and guides unfortunately.
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Old 03-03-2021, 05:36 AM   #13
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Quote:
Originally Posted by PorknBeans View Post
Have you pulled the injector harnesses to check the resistance on each of the injector's coils?

Specs are 10 - 14 ohms at 77*F for a 1996 HB model.

It's a quick determination if the coil(s) are good on each injector. Just put the 2 DMM meter leads across the terminal pins and read the Ohm's. At least with this test. You can potentially eliminate a bad coil(s). Are these original injectors? Hitachi? Aftermarket? Sticking injector needle? Coil giving high resistance at 3500 rpm?

How about a fuel pressure test? All Grounding points clean and tight? I would check for continuity at ALL connectors/connections. These are points of looseness, bad crimps, corrosion etc.

I would also perform continuity tests from the ECM's harness, when disconnected, to the injector's harness connector. Set your meter to "tone". So that you can hear the "beeeeeeep", if continuity is achieved. Factory Manual on page EC(Engine Control)-280 shows that Pin 102 is Injector #1, Pin 107 is Injector #2, Pin 104 is Injector #3 and Pin 109 is injector #4. Check for continuity AND power to the injector's harness. Should show battery voltage at 12VDC -14VDC.

You can even use a screwdriver to listen to the "taps" of the injector needle when the coil is energizing and deenergizing. I use a mechanic's stethoscope to help listen to specific places on a component for testing.

These tests will hopefully eliminate key elements that may have been overlooked or worse. Never checked. Devil's in the details. Proceed with a fine tooth comb. If not, you will be chasing this problem and a turbo engine may never happen.

Just some thoughts to consider...
Thank you so much buddy, I appreciate your help. When I get the time I’ll run through the list and report my findings!
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Old 03-03-2021, 06:11 AM   #14
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mine was missing on cylinder one, pulled injectors and got them inspected/cleaned and sure enough, the one was really bad causing my misfire. they all had rust in them though, so i’ve already replaced them with new ones and the truck runs perfect.
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Old 03-03-2021, 03:15 PM   #15
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So no codes and you've replace a bunch of parts for a misfire. By chance have you listened to another 96-97 HB to see if its the same and you are chasing ghosts?
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Old 03-04-2021, 04:42 AM   #16
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Quote:
Originally Posted by OldGreyBeast View Post
Does it seem to always miss on the same cylinder or does it move around? Could be a wonky injector that's working better at higher output but on the lower end it's being goofy.
The misfire bounces around, from being every once and a while, to three strokes in sequence.
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Old 03-04-2021, 04:43 AM   #17
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Quote:
Originally Posted by dvdswan View Post
So no codes and you've replace a bunch of parts for a misfire. By chance have you listened to another 96-97 HB to see if its the same and you are chasing ghosts?
Iíve tried and no one seems to have to go this far with ghost busting. Iím dumbfounded and confused if Iím being honest- I even went ahead and cleaned the frame, engine, and firewall grounds today- still nothing?!?
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Old 03-04-2021, 11:37 AM   #18
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Seafoam treatment time
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Old 03-04-2021, 08:10 PM   #19
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Quote:
Originally Posted by jp2code View Post
Likely an injector and exhaust manifold leak.

Also sounds like you need to do the timing chain and guides. That will cause the lifter noise.
Iíve already done the guides and chain- timing is set to 15btdc
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Old 03-04-2021, 08:21 PM   #20
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Quote:
Originally Posted by tannerg1223 View Post
Iíve already done the guides and chain- timing is set to 15btdc
Really? New information.

How long ago did you do this? Like, how many miles have you put on the engine since doing the timing chain?
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