Rough running?

Tiny
SHIPWRIGHT
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I recently picked up a 1954 Chrysler Windsor with a LM7 5.3 Gen 3 swap out of a 2001 Silverado, I believe. It idles fine but runs bad on acceleration. Purge valve is abandoned. No wires or vacuum lines. No charcoal canister. No vac line to fuel pressure regulator either. I installed a vacuum line to FPR from intake manifold. No change. I'm going to try the carburetor cleaner trick for vacuum leaks tomorrow. Anything else I should look at? Thanks
Sunday, September 3rd, 2023 AT 5:56 PM

4 Replies

Tiny
SHIPWRIGHT
  • MEMBER
  • 3 POSTS
I checked the fuel pressure at the rail. It is around 55 PSI with no change on acceleration.
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Sunday, September 3rd, 2023 AT 6:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,149 POSTS
Way cool! sweet car can you upload some picks? Also, I would install a new set of spark plugs and coils they go out often on these engines.

Here is a swap we did in our shop:

https://youtu.be/mN5ct7bafTI?si=qPZWm34Ia1DbFp66

This guide may help as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Monday, September 4th, 2023 AT 12:30 PM
Tiny
SHIPWRIGHT
  • MEMBER
  • 3 POSTS
Thanks, Ken.

I just located the OBD2 port under the carpet under the seat. Going to scan it tomorrow and see what codes pop up. I’ll keep posting my progress. I have new spark plugs, coils and wires coming this week. Checking vacuum tomorrow too. Love your video and project car. Thanks for your reply.
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Monday, September 4th, 2023 AT 1:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,149 POSTS
Wow, super cool ride. Thanks for the image. I think the plugs and coil will fix it, also don't forget to install new plug wires as well.
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Tuesday, September 5th, 2023 AT 11:07 AM

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