Question about 1999 GMC Jimmy

1 Answer

There is a knocking noise coming from the engine area when i press on the throttle. There is no check engine light, and oil pressure is fine. What could be the problem?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 6,982 Answers

Look everywhere but two items can do that...a bad wrist-pin (connects rod to piston... generally a closely spaced double knock) or a cracked flex plate (sounds a lot like a bad rod bearing)

Posted on Oct 07, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

ALTHOUGH MY DIPSTICK READS FINE, WHENEVER I PUSH ON THE BRAKES, MY OIL PRESSURE GOES DOWN TO 0 AND MY CHECK GAUSES LIGHT COMES ON


I would say that you are definitely low on oil pressure. The oil pump is usually located inside of the oil pan. Depending on what vehicle you have you might have to have the engine removed to access the oil pan to get to the oil pump. I know on a Cadillac Northstar engine you get 43 hours to do an oil pump.

Jun 05, 2015 | Cars & Trucks

2 Answers

2004 explorer engine knocking


Check the oil pressure manually with a gauge. Make sure you have oil pressure. Perhaps you need a new oil pump, or new lifters. Get a professional opinion from a non interested party. Save money, get a diagnosis.

Apr 18, 2014 | 2004 Ford Explorer

2 Answers

Knocking noise


First confirm the oil level is adequate by checking the dip stick. If the oil level is okay you may have a partial blockage that is starving the oil line leading to the sensor. Missed regularly scheduled oil changes may result in this happening.
If sludge is the problem your dealer can recommend an oil additive that may clear out the problem.
You may also have a failed sensor as well.

Dec 02, 2013 | 1988 Jeep Cherokee

1 Answer

2003 vw jetta oil pressure switch light keeps coming on and mechanic says oil pressure is fine when he tested. Did engine flush and so forth. No strange knocking noises, engine runs smooth. Does anyone...


Could be a faulty pressure switch. But which engine do you have? The 1.8T is notorious for getting sludge build-up on the oil pan, thus restricting the oil pump pick-up screen.

Jan 25, 2013 | Buick LeSabre Cars & Trucks

1 Answer

1995 Ford Windstar Engine Knocking at startup. Driven 2800 miles since last oil/filter change. Oil level SAT, Coolant level SAT and no visible leakage. Engine completely rebuilt 2 years ago. Engine has...


No if the oil light has flickered you have oil pressure loss some time just belive the sensor do help us out. lifter do not cause oil pressure loss pressure is built in the rotation of the crankshaft. The knock under the plenum will point you to that cylinder that is affected, (main bearing) as for a 1995 the injectors can only cause a misfire but no knocking noise,will they honor the warranty

Apr 21, 2011 | 1995 Ford Windstar

4 Answers

Loud knocking noise comming from engine?


1995 Ford Windstar 3.8L Engine Knocking noise on top side of engine near center of Air Plenum. Engine was completely rebuilt 2 years ago (28,000 miles on Re-Built Engine/ 156,000mile on Van). Coolant level is SAT, Engine oil level is Sat. Van was driven 2800 miles since last oil/filter change. Engine started surging as van slowed down to make a stop then engine shut off. Restarted engine and heard knocking noise. Shut engine off immediately. The oil light flickers on dash with engine running. Do fuel injectors make tapping noises when degraded? Is it possible hydraulic lifter not able to leak down or does not fill with oil? Oil pressure issue with the dash light flickering? I can see if the engine has allot of miles on it, the intake and exhaust valves begin to leak-by how ever this not the issue. Where do you start to locate engine knock noise? How is oil pressure checked to see if pressure is too low? Any help where to start would be appreciated.

Feb 10, 2011 | 1995 Ford Windstar

2 Answers

I have loud knocking sound when the throttle is pressed down halfway or more, and the knocking gets louder the further I press the pedal. However, the engine idles fine and accelerates smoothly at low...


Make sure you have enough oil in the engine (though it's likely too late) If you have knocking and oil light on, sorry to say, you likely have lost a rod or crank main bearing (engine needs to come out of car and completely apart (very expensive) Options are a re-manufactured or scrapyard replacement.

Oct 19, 2009 | 2002 Chrysler Sebring

1 Answer

Engine knock hard over 2500 rpm


Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

Aug 22, 2009 | 1996 Dodge Stratus

1 Answer

My car is making this weird knocking noise and people tell me its the timing chain it wont go over 40 mph now it drove fine till i had it out one day and it lost power and started knocking it still runs...


The rod knocking is caused by loss of oil pressure. Did the oil light not come on? That light is red, red means stop. Do not start this engine again until the problem is corrected.

Have you checked the oil level?

Mar 16, 2009 | 1994 Pontiac Grand Prix

1 Answer

1995 nissan quest minivan gxe v6 - noise under the hood


low or no oil pressure... check the level of the oil .. add if necessary and have the oil pressure checked

Robert

Jan 26, 2009 | 1995 Nissan Quest

Not finding what you are looking for?
1999 GMC Jimmy Logo

337 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

77201 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...