Question about 1991 GMC Sonoma

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Cars running rich

2.8 liter hard to start running rough and rich

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  • 14 Answers

Remove the EGR valve and make sure there isnt a big peice of carbon stuck in the pintle.

Posted on May 18, 2014

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Posted on Jan 02, 2017

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keemo68
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SOURCE: 2001 gmc jimmy

the ......fuel pressure regulator is on the fuel rail near the rear of the intake manifold it is round in shap. i would first check to see if you have a problem with your O2 sensors. also i would have the TPS sensor checked. the TPS is what controls your idle. it is located on the throttle body is black in color and has a weatherproof plug to it. please rate this.........thanks

Posted on Sep 01, 2008

redds55
  • 2620 Answers

SOURCE: 1998 gmc 454 hard starting and rough idle it turns

Sounds like you might have a bad fuel pressure regulator.You can check it by pulling the vacuum hose off it and if you see any fuel run out then the regulator is faulty.

Posted on Nov 02, 2011

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Ford zx2 running rough


swap the injectors from the original engine they go bad sitting in a junk yard with old fuel sitting in them

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1998 gmc 454 hard starting and rough idle it turns over to long before starting and runs rough a little rich could it be timing


Sounds like you might have a bad fuel pressure regulator.You can check it by pulling the vacuum hose off it and if you see any fuel run out then the regulator is faulty.

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Had timing belt changed on a 2004 Intrepid and now code P-0175 is showing and car runs really rough.


This means that the o2 sensor in bank 2 detected a rich condition.This can be caused by a dirty mass air flow sensor or there could be a vacuum leak or a fuel pressure problem.

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I have a 2004 f-150 5.4 liter with 100,000 niles


When was the last tune-up?

Inspect few plugs for carbon ash (lean running) or wet (rich running).

Clean Mass Air Flow sensor with CRC Mass Air Flow Sensor cleaner

Change air filter

Change PCV valve (under $10 item)

Ran a tank of Chevron gas with LUCAS fuel system cleaner additive.


Inspect for vacuum leak.
Start from the brake booster (round metal drum) and work you way outward.

Jan 27, 2010 | 2004 Ford F150

1 Answer

Runs to rich


i think it Needs a tune up.

A bad Fuel Pump can cause starting problems and so can a bad timing belt. How many miles are on the car? If it's more than 100,000...take a look at your timing belt. Is it worn? Chrysler recommends replacement at 60,000 but some last up to 100,000. Any longer than that is pushing it and asking for a problem. A bad fuel pump will not allow enough fuel to fire the engine.

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