TPI idle rough

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Jan 6, 2015 | 08:00 PM

s6tyn9

Thread Starter

Cruising

Joined: Dec 2014

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TPI idle rough

History...fuel regulator busted fuel flowing to the plenum causing cylinder 6 and 8 flodding, replace regulator diafram, now won't idle right. Tested the fuel pressure barrowed fuel pressure gauge from Aurozone not sure if gauge is working right coz during the initial fuel pump prime the reading beyond the gauge (110+ psi) is that normal? I don't think so...while on rough idle the gauge still reading 110+. Is too much pressure can cause the rough idle and also do I have a bad fuel regulator?

Jan 7, 2015 | 01:01 AM

dugsgms74

Burning Brakes

Joined: Mar 2014

Posts: 904

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From: Crestline CA

If the pressure is indeed 110+psi that will definitely cause a rough idle. Try a different gauge and if it still reads high replace the regulator and check for a plugged return line.

Jan 7, 2015 | 01:03 AM

Amorget

Pro

Joined: Oct 2008

Posts: 708

Likes: 27

Too much fuel pressure can cause bad idle (too much fuel). Fuel pressure should be 45ish psi off and in the low/mid 30s idling.

Jan 7, 2015 | 01:35 AM

s6tyn9

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Cruising

Joined: Dec 2014

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Yes indeed the return line is clogged with rust and other stuff right after the rail where the fuel hose connect to the return tube. So its clear now did put air to it and its clear. The idle still rough maybe I need to clean the injectors coz for sure that dirty stuff that clogged the return may have gotten into the injectors.

Jan 7, 2015 | 08:30 PM

s6tyn9

Thread Starter

Cruising

Joined: Dec 2014

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After uncloging the return line and did another fuel pressure gauge test the remain 0 (zero) while cranking and want to start rough idle then died. is it a bad regulator?