302 engine issues.
Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I took the truck out for a drive today and I have a few questions. My truck was tuned and running very good in 32 degree temps. Today it was 77 degrees and my truck ran strong but I noticed some popping on deceleration and it felt like I had some minor surging at cruise. I checked my engine with a vacuum gauge in the garage and I have a steady 19. Could my choke setting cause these symptoms?
Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I did all the tuning at operating temperature, what else would cause surging at cruise?
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I'd think you'd have a vacuum leak. What did you do with the transmission in it since this began ? I'm thinking you have an automatic in it right ? The modulator valve diaphragm may have ruptured with the spirited driving you mentioned.
Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I have a three speed manual on the floor. I will drive it again this weekend and see if I get the same results.
Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I took the truck out for a drive today and I have a few questions. My truck was tuned and running very good in 32 degree temps. Today it was 77 degrees and my truck ran strong but I noticed some popping on deceleration and it felt like I had some minor surging at cruise. I checked my engine with a vacuum gauge in the garage and I have a steady 19. Could my choke setting cause these symptoms?
Laughing Gas
Joined: Apr 2014
Posts: 884
Likes: 5
From: Shreveport, LA
Power valve size is supposed to be: full operating temperature, slight load on the engine, take a full vacuum reading, half of that. A 9.5 is too much.
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Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I still have the stock Duraspark ignition. With the 6.5 PV I had a hesitation, with the 9.5 PV I have surging. I will try something in the middle. I also went from 91 octane gas to 87 octane, non ethanol of course. Another change I recently did was the installation of a fuel pressure regulator to get fuel pressure from 10 psi to 7 psi.
Thread Starter
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Elder User
Joined: Jun 2015
Posts: 664
Likes: 2
From: York Pa.
I did a few months ago, everything was fine, I guess I could try again. Remove cap and look for rotor to move by applying pressure to hose right?
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
It's the pot metal box connected to the distributor via a wiring harness.. When they first came out in the 70's they were notorious for failing muy pronto.