Question about 1995 GMC Sierra C1500

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Engin runnig ruff. enjecters dupping alot of fuel. gas is burning rich.takeoff is dragging. no power at all. i already replced the egr valve,and altenator, and checked all vacum lines for leaks.i did a complet tune p but still cant figure it out

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NEW FUEL INJECTORS , I HAD THE SAME PROBLEM .

Posted on Dec 12, 2013

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If it is the throttle body type you will have to replace the injectors, the alchol in gas kills th plastic parts in the injectors, be sure to buy from the dealer and get the new ones that will work with ethnoal, also costs $105.00 each there are two of them.

Posted on Nov 12, 2009

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87 ford ranger 2.3 engine at idle runs ruff. Taking off it bogs down once rpm 's are up runs smooth allso blows black smoke now and then .don't smell like oil burning looks like soot


Sounds as if the engine is running rich ( over fueled ). There are many reasons for this issue. I'm suspecting the vehicle is fuel injected? You can check for a leaky fuel pressure regulator on the fuel rail and also a sticky/stuck EGR valve that can cause this problem. These are the quickest and easiest checks to do first. IF all ok, you may require the use of a scan tool to check sensors/codes for proper operation and look at any available data stream that may point you in the right direction

Aug 29, 2015 | Ford Cars & Trucks

1 Answer

92 jeep cherokee will not start when hot,starts when you hold the gas pedal to the floor ? Then runs ruff cuts off.


replace the fuel filter then check the air/fuel mix needle valve according to manufacturer specs. Sounds like you have way to rich a fuel mixture.

Aug 08, 2014 | 1992 Jeep Cherokee Sport

2 Answers

Wont pick up speed on take off


take the fuel filter off for fun and see if ya can blow through it at least fast and not cost but a few min s...
If burning a lot of gas ,,timing ?...bad plugs ..wires
you can check wire out by just unplugging one and seeing if that changes idle at all until ya find one that does not ...wooot bad plug or wire...

Nov 26, 2013 | 1995 Chevrolet Blazer

1 Answer

Ford f250 runs ruff and will not idle


fuel pressure should be 35 - 45 psi.could have faulty tps sensor.could have intake vacuum leak or ignition timing valve timing off due to worn timing chain.do engine vacuum test replace all vacuum hoses bad leaking egr valve diaphram or gasket will cause engine run poorly.

Jul 29, 2013 | 1997 Ford F250 SuperCab

1 Answer

1988 ford ranger 2.3l 5spd 2wd. Exhaust pipe tip is black. Fuel mileage is 13mpg. Replaced fuel filter; 8 plugs and wires, o2 sensor,thermostat,air filter,egr valve,cleaned iac and intake,ran sea foam...


The regulator is on top of the engine along the gas line. It has a vacuum line on top. Start the truck and pull the vacuum line off the regulator. If fuel comes out of the regulator, it has failed. You can run pretty rich with a busted regulator-especially at idle.

May 24, 2017 | Cars & Trucks

1 Answer

I brought it to advance auto for them to check it.Diagnostic said Malfuctioning egr valve.Can this cause the vehicle to idle alittle ruff & Hesitate on acceleration?Any advice would help alot ty.


Absolutely. The EGR controls the air to gas ratio in the sense that recycling unspent gas vapor is a large part of the engine's combustion. If it is faulty, expect hesitation or shuddering. Also, the EGR valve is cheap and easy to install on most vehicles.

Nov 10, 2012 | 2001 Chrysler Voyager

1 Answer

I have a 96 sonoma 2.2 thats running too rich and has a p1406 code


P1406 EGR Valve Pintle Position Circuit Fault
This code is usually caused by carbon buildup in the EGR valve. The carbon deposits prevent the valve from closing completely.

After removing the EGR valve, clean the pintle seat area of the valve and the corresponding passageway in the engine.

or simply replace the EGR valve.

The purpose of you EGR Valve is to recycle un-burned fuel back into the engine, not only improving fuel economy by reducing the engines pumping losses, the EGR increases the mass in the intake; more mass means higher pressure, or less vacuum. Now the piston has less resistance during each intake stroke, which results in better gas mileage.

So if your EGR Valve is clogged, damaged or simply just not working - the those rich un-recycled fuels will make your car burn richer. (Which will make you burn more fuel.)

Hope this helps!

Mar 07, 2012 | Cars & Trucks

1 Answer

Sputterin loses power at 35mph


Possible causes:
Clogged fuel filter Low fuel pump pressure
Defective Catalytic converter Defective EGR valve
Incorrect fuel pinched/kinked fuel line
Malfunctioning Throttle position sensor Defective MAP sensor
Vacuum leak
...if your check engine light is flashing, then you are burning excessive amounts of gas which would indicate a rich condition.

Aug 26, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

2004 duramax black smoke and sputtering when


Black smoke means "fuel not being combusted" or "runnig rich". I have no doubt you have gasoline. Your spark may not be burning the gas. Is there a check eng lite? If EGR was sticking, you would probably get a check engine light for this. If your truck has a Vortec design, I would find out if you need a new "spider". What is your mileage? Are you due for a tune up? What spark plugs are you using? Vortec? "Not all the time" sounds like intermittent. When was the last time you changed the fuel filter? Can't hurt to change this. This would be the actaul starting point for me. I would change the fuel filter which is under the driver under the chasis. You will need a 16MM and a 20MM. USE ONLY LINE WRENCHES. You may need a fuel line disconnect kit too depending on your model. Notice it only happens on acceleration? that is when you are forcing even more fuel thru the system, but not enough of a fuel stream make cause sputtering and when the fuel comes thru too rich that would be the black smoke. It sounds like you have the 2 extremes. is there afuel regulator on your vehicle? If so, you may need to change that too. Good luck.

Sep 10, 2009 | 2002 Chevrolet Silverado 2500HD

1 Answer

94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve


Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

Hope this helps and good luck!

Aug 18, 2008 | 1994 Geo Metro

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