Question about 1998 GMC Sierra

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1998 gmc 7.4 litre idle loping

Warm engine idle loping when in park, in gear

Posted by Anonymous on

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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  • 58 Answers

SOURCE: rough idle and lopes

Those 4.3L's have a Central Port Fuel Injection system with one injector in the middle of the intake under the plenum, they are good for either the fuel pressure regulator or the plastic lines (that are inside the intake that feed the injector) leaking inside and flooding the intake with fuel. The best way to tell is to take the plenum off and thurn the key to prime the fuel pump and watch for leaks.

Posted on Nov 18, 2008

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SOURCE: low oil when engine warms up gmc sierra 1995

30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

Posted on Dec 07, 2008

  • 398 Answers

SOURCE: Replaced 305 engine with 350, runs poorly at steady speeds

try replaceing/testing knock sensor, unless you already did

Posted on Mar 07, 2009

  • 202 Answers

SOURCE: 1998 GMC SILVERADO FIXED AND REPLACED EVERYTHING ,HIGH IDLE

have you replaced your intake gaskets? this is a problem on these trucks with high milage. to see if your intake is leaking spray it down with Brake cleaner and if it is leakin you will hear a drop in Rpm's
hope this helps
please rate me
Thank you
Aaron

Posted on May 08, 2009

  • 68 Answers

SOURCE: 1998 gmc 2500 4x4

check for vacom leak on engin intake

Posted on Mar 15, 2010

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1 Answer

Car lopes as soon as it warms up


idle air control is looking for base idle. throttle body base idle plate is dirty with carbon. cleaned out throttle plate with carb cleaner and tooth brush. use rags to catch black carbon.open plate.by some one hold throttle plate open with gas pedal. engine not running. after completed, start engine. run 1500 prm for a short time to clean out excess fluid. that should fix your problem..

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1998 Lincoln Mark VIII sometimes stalls when idling in gear


Do you have a "Check Engine" light?

Check the coils in each cylinder. At 140k the valve cover gaskets tend to break and oil will fill the coils causing misfires and stalling.

Feb 14, 2012 | 1998 Lincoln Mark VIII

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1998 gmc 2500 4x4


check for vacom leak on engin intake

Mar 15, 2010 | 1998 GMC Sierra

1 Answer

Engine lopes at idle and check engine light on


In this case having the check-engine light is a good thing. Take the car to AutoZone and have them scan the computer for codes - they do it for free, whereas a shop will charge up to an hour's labor. Have them give you a printout of the codes, and post them here as a comment/reply. I can help you define them and see what needs to be done.

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1 Answer

Loping idle with a '98 Subauru 2.5


This usually happens when the fuel pump is loosing pressure.

I will just advice you make a replacement on the fuel pump. It is located in the fuel tank beneath the back seat.

Be sure to consider the rating on the fuel pump when replacing.

Good luck and rate my solution.

Dec 03, 2009 | 1998 Subaru Legacy

1 Answer

Engine speed hunts on idle. Auto trans slow shift.


The fast idle valve is inside the throttle body. Sometimes it backs out and needs turned back in (it's threaded). This will cause the loping idle.

Get transmission filter changed with new fluid. Honda does not recommend transmission flushing.

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1 Answer

93 Lincoln Conti. Runs rough in gear


Probably a bad idle air motor, it controls idle electronicaly

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1 Answer

Engine lopes while idling or idles erratically


1.vacuum leak
2.leaking egr or plugged pcv valve
3.ignition components damp or damaged
4.faulty or incorrectly gapped spark plugs
5.faulty plug wires
6.faulty emmission components
7.air filtr clogged
8.leaking head gasket
9.timing chain or gears worn
first check air filter then check timing with a light make sure its steady if it bounces around the your chain/belt is needing replaced check your wires for frays or just replace them cause their 10 years old

Feb 09, 2009 | 2002 GMC Envoy

1 Answer

Replaced 305 engine with 350, runs poorly at steady speeds


try replaceing/testing knock sensor, unless you already did

Dec 01, 2008 | 1996 GMC Sierra

1 Answer

Engine Intermittent Stalling and Missing/Loping


***** is correct adn yoru issues are not a quick fix.. some sensor is acting up and /or computer is being told to do something .....get full scope done and dig towards cause that way

Nov 02, 2008 | 2006 Dodge Dakota

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