1995 Yukon runs rough

BNUTTER3

MEMBER
1995 GMC YUKON
V8
4WD
AUTOMATIC
180,000 MILES

I have a 1995 gmc yukon, Runs terrible at low rpm, hesitates, lurches, coughs, but if you are able to get up to speed about 2700rpm and above it runs pretty good. REPLACED: plugs, wires, cap, rotor, coil, o2 sensor, tps, map sensor. What else?

Sunday, November 14th, 2010 AT 1:53 PM

2 Replies

HMAC300

MECHANIC
48,601 POSTS

You should run a scan on the engine. Most auto parts stores do this for free. But check your fuel pressure if it's below 55 it may be to low. But if it's low around 55 then change your fuel filter. Also get a can of choke cleaner and clean the throttle plate on both sides andthe oblong hole next to it. The engine may start hardafter doing this however. Make sure to hook up air duct after doing this or it wont' run right. Then take choke cleaner andspray edges of intake checking for vacuum leaks if it still runs rough. But getengine scanned.

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Sunday, November 14th, 2010 AT 2:46 PM

BNUTTER3

MEMBER
3 POSTS

Thanks hmac300, Just an update, as maybe it will help someone else,
Dropped fuel tank, problem was obvious, the lines on the sending unit were rusted to less than half there normal diameter and pin holes were present. I was able to snap the metal (rusted) lines in half with two fingers. Bad news. The entire fuel line looks the same. This is a vehicle that still looks like new on the outside. Not the first hint of rust. I was shocked. Thanks again

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Monday, November 15th, 2010 AT 4:35 AM