Strange Misfire Problem
Lead Driver
Joined: Mar 2006
Posts: 6,259
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From: IL
It could be a coil that maybe has a hairline crack, or is going bad but 1 bad coil wouldn't give multiple misfires.
If you have an OBD tester that can collect live data that would be your best bet to narrow the problem. If you don't have one, most local shops depending on your area will run the diagnostic for you for around $100.
I have a small stumble in my 5.4L also, but I'm just going to wait until I have to remove the bed because of rust, then I'll change the FP as a precaution.
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Senior User
Joined: Nov 2015
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Well you don't state how many miles on the truck or how it's been maintained. But I would start with checking the fuel pump pressure at start up, then after it warms up and starts misfiring, I would try to make sure it's tested during misfire, if it's low pressure then you probably found your culprit. It could also be the fuel pressure regulator. After that would be the EGR and Vacuum.
It could be a coil that maybe has a hairline crack, or is going bad but 1 bad coil wouldn't give multiple misfires.
If you have an OBD tester that can collect live data that would be your best bet to narrow the problem. If you don't have one, most local shops depending on your area will run the diagnostic for you for around $100.
I have a small stumble in my 5.4L also, but I'm just going to wait until I have to remove the bed because of rust, then I'll change the FP as a precaution.
It could be a coil that maybe has a hairline crack, or is going bad but 1 bad coil wouldn't give multiple misfires.
If you have an OBD tester that can collect live data that would be your best bet to narrow the problem. If you don't have one, most local shops depending on your area will run the diagnostic for you for around $100.
I have a small stumble in my 5.4L also, but I'm just going to wait until I have to remove the bed because of rust, then I'll change the FP as a precaution.
Lead Driver
Joined: Mar 2006
Posts: 6,259
Likes: 438
From: IL
You never know, replacement pumps are known to fail, espaecially if they're not OEM. My dad had his pump replaced 3 times in his Chevy conversion van in as many years, pumps cam from NAPA. I finally found a good Chevy mechanic that told me if they weren't replacing the FP relay with the pump that the pumps would fail early. He replaced it with an OEM pump and relay, never failed again.
Being the engine was rebuilt, anything could have happened at this point, The FP, Vac, EGR, should all be checked, all these systems have been touched when they rebuilt the motor. Even just unplugging and moving lines and wires can cause a problem down the road.
Being the engine was rebuilt, anything could have happened at this point, The FP, Vac, EGR, should all be checked, all these systems have been touched when they rebuilt the motor. Even just unplugging and moving lines and wires can cause a problem down the road.
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
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Senior User
Joined: Nov 2015
Posts: 290
Likes: 0
You never know, replacement pumps are known to fail, espaecially if they're not OEM. My dad had his pump replaced 3 times in his Chevy conversion van in as many years, pumps cam from NAPA. I finally found a good Chevy mechanic that told me if they weren't replacing the FP relay with the pump that the pumps would fail early. He replaced it with an OEM pump and relay, never failed again.
Being the engine was rebuilt, anything could have happened at this point, The FP, Vac, EGR, should all be checked, all these systems have been touched when they rebuilt the motor. Even just unplugging and moving lines and wires can cause a problem down the road.
Being the engine was rebuilt, anything could have happened at this point, The FP, Vac, EGR, should all be checked, all these systems have been touched when they rebuilt the motor. Even just unplugging and moving lines and wires can cause a problem down the road.
Posting Guru
Joined: Jun 2009
Posts: 1,908
Likes: 20
From: Fort Smith, Arkansas
Yes, there or ebay. A big box store might have them in stock but it would probably be cheaper online.
Check the bottom of this wiki for "adapters not currently supported".
https://torque-bhp.com/wiki/Bluetooth_Adapters
I saw a daily deal last year on a random online etailer and bought 2 of the short blue ones (clone 6) for $6 apiece and they both work great. I wish I would have bought more of them, at that price you can keep one in every vehicle. But I had never bought from there before so I only rolled the dice for 2.
Check the bottom of this wiki for "adapters not currently supported".
https://torque-bhp.com/wiki/Bluetooth_Adapters
I saw a daily deal last year on a random online etailer and bought 2 of the short blue ones (clone 6) for $6 apiece and they both work great. I wish I would have bought more of them, at that price you can keep one in every vehicle. But I had never bought from there before so I only rolled the dice for 2.
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