Quote:
Originally Posted by caffeineaholic
1985 Caprice 5.0L 305 Carbureted (Electronic Q-jet) A/T 700R4
111,000 miles; engine rebuilt (top only) about 8 years ago
Hi all,
My car has been sluggish/chugging at idle when under load (in drive/reverse etc.) or at light/medium throttle (particularly around 20-30mph before shifting into 3rd gear).
It sounds more like a diesel engine now and the exhaust tends to "exhale" in puffs of air rather than a bit more smoothly like normal.
I checked for spark, wires, distributor, and I replaced the cap and rotor.
I then checked fuel (and replaced the fuel filter) and I still have the same problem.
I noticed the my fuel pressure is very high for some reason and I get a reading off the scale on my pressure tester -- it's over 10 psi up to about 12psi or so. It's carbureted and I think that it's supposed to only be around 5.5 to 7psi.
By the way I also checked for a restricted CAT or misc. in the exhaust by the book and it reads normal (below 2.25psi at 2500rpm). The CAT is original AFAIK. The EGR valve seems to be working okay and I checked that as well according to the book.
I do have a small vac. leak on the carburetor because the top part is warped; however, I have had this problem for a while and it is not likely the reason -- it shouldn't be any worse.
Thanks for your time.
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check the return line for damage. re route the return line at pump into a bucket then recheck pressure..10-12 psi too high ..should be around 6psi,,...