Got a miss
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Mar 28, 2024, 03:30 PM
Thread Starter
Pro
Joined: Dec 2018
Posts: 534
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From: Tampa Bay Fl
Found the problem, bad fuei injector. Thanks for everybodys input.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Could be an injector or injector wiring...possibly coil or coil wiring but highly doubtful because they are bulletproof...could be mechanical too...if you want to drive a few hours south I'd be happy to look at it for you...I use the most advanced testing techniques.
Melting Slicks
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From: East Metro (Twin Cities) Minnesota
St. Jude Donor '21
Melting Slicks
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Did that plug look any different than the others? Is this car new to you and has had the miss since you bought it a week ago or is this a new problem that appeared out of nowhere? Had the valve covers off to see if the valves are moving any different than the others?
Thread Starter
Pro
Joined: Dec 2018
Posts: 534
Likes: 181
From: Tampa Bay Fl
Change the coil no improvement and it has compression. Never thought about the injector maybe tomorrow I'll try that. Just been a big pain in the ***. Thanks
.
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From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Check the wire harness at the back by the firewall on the left side. There is a bracket back there that is known for chafing the wires inside that part of the harness
Last edited by Smoken1; Mar 24, 2024 at 10:51 PM.
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Racer
Joined: May 2021
Posts: 403
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P0354 code
I've got a similar problem, p0354 code, no misfire code, I've got no P0304 not even a P0300, just P0354. I moved coil, wires, plugs, injectors, then replaced plugs and wires, pulled computer and signal traced all wires, wiggle tested the wires, opened computer to check for weak solder joints/burnt components, ran an oscilloscope test, checked that the spark plug is tan showing it is burning fuel, cleaned ground points at battery to frame, right front, left front, under master cylinder, and cleaned and tightened bolts that hold coil packs.
Last thing done to car prior to this problem was clutch install job done by me. There is a wire loom holder on the back of engine top right that holds the wiring harness in place, and is bolted to the bell-housing-to-engine that I didn't bolt down.
What's next? Anyone near Lakeland that can pay eyes on this to double check me? Does the wire loom holder top right back of motor also serve as ground for the wire harness?/engine?
Last thing done to car prior to this problem was clutch install job done by me. There is a wire loom holder on the back of engine top right that holds the wiring harness in place, and is bolted to the bell-housing-to-engine that I didn't bolt down.
What's next? Anyone near Lakeland that can pay eyes on this to double check me? Does the wire loom holder top right back of motor also serve as ground for the wire harness?/engine?
Last edited by douglasjre; Mar 25, 2024 at 11:09 AM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,620
Likes: 4,066
From: Cape Coral, Florida
I've got a similar problem, p0354 code, no misfire code, I've got no P0304 not even a P0300, just P0354. I moved coil, wires, plugs, injectors, then replaced plugs and wires, pulled computer and signal traced all wires, wiggle tested the wires, opened computer to check for weak solder joints/burnt components, ran an oscilloscope test, checked that the spark plug is tan showing it is burning fuel, cleaned ground points at battery to frame, right front, left front, under master cylinder, and cleaned and tightened bolts that hold coil packs.
Last thing done to car prior to this problem was clutch install job done by me. There is a wire loom holder on the back of engine top right that holds the wiring harness in place, and is bolted to the bell-housing-to-engine that I didn't bolt down.
What's next? Anyone near Lakeland that can pay eyes on this to double check me? Does the wire loom holder top right back of motor also serve as ground for the wire harness?/engine?
Last thing done to car prior to this problem was clutch install job done by me. There is a wire loom holder on the back of engine top right that holds the wiring harness in place, and is bolted to the bell-housing-to-engine that I didn't bolt down.
What's next? Anyone near Lakeland that can pay eyes on this to double check me? Does the wire loom holder top right back of motor also serve as ground for the wire harness?/engine?
Did you scope the #4 coil signal wire AT the PCM ??…if you see either 3-20 Hz or a 0-5 volt square wave with the engine running at the PCM the PCM is putting out a signal…did you check the brown Low Ref. wire at the coil pack ??…that is the ground for the signal wire and best checked with a test light or better yet an old headlight connected to B+.
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Moved to C5 Tech for further discussion.
Racer
Joined: May 2021
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Did you scope the #4 coil signal wire AT the PCM ??…if you see either 3-20 Hz or a 0-5 volt square wave with the engine running at the PCM the PCM is putting out a signal…did you check the brown Low Ref. wire at the coil pack ??…that is the ground for the signal wire and best checked with a test light or better yet an old headlight connected to B+.
Racer
Joined: May 2021
Posts: 403
Likes: 64
Just back probe the coil pack signal wire at the PCM and with the scope set up check for that 0-5 volt square wave.
https://youtu.be/LcMl8rWXiHA?si=9dKYkZ6tUjKK5VlX
https://youtu.be/LcMl8rWXiHA?si=9dKYkZ6tUjKK5VlX
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,620
Likes: 4,066
From: Cape Coral, Florida
Like I mentioned you have to backprobe the signal wire AT the PCM and if no signal you need a new PCM…that’s all I can tell you !!
Advanced
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From: Cape Coral, FL
Any chance you go by Bob or Bobby?
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Can you shoot me a message or even a reply back about the price of running these tests? I live in Cape Coral as well. I have a 99 C5 FRC Base and I think it just needs the timing adjusted on the lower RPM (I made a post about this if you'd like to look it over with much more information provided)
Any chance you go by Bob or Bobby?
Any chance you go by Bob or Bobby?