Question about 2001 Chevrolet Tahoe

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Sluggish acceleration I just replaced the egr valve in my truck. But this morning as I was trying to speed up it couldn't get out of its own way. Why??

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  • 77 Answers

First thing I would do is get a scan tool and read the codes...it could be anything from a sensor gone bad to a faulty fuel pump.

Posted on Jul 17, 2014

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Posted on Jan 02, 2017

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jgwhomeequip
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SOURCE: EGR Valve Cleaning on a 1999 4.3 Silverado

If it is not just badly clogged, the intake does not need to be cleaned out. If you want to clean it out then take some brake cleaner and spray it in there and wipe it with a rag. I have never seen someone have to clean the intake due to not being clogged. Just my expierence I would just change the EGR and go from there

Posted on May 21, 2009

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SOURCE: Acceleration problems replaced EGR valve, flushed

michael is driving his sports car at 30 m/s when he sees a dog on the road ahead. he slams on the brakes and comes to a stop in 3.0 seconds. what was the acceleration of michael's car?

Posted on Nov 05, 2009

  • 61 Answers

SOURCE: Truck accelerates sluggishly, then at cruising

over loading,,ck temp sencers to see if they are reading correctly, if temp sencers are reading cold after truck has warmed up,there telling the ecm to richen the fuel,,

Posted on Dec 13, 2009

ZJLimited
  • 17970 Answers

SOURCE: I have a 2003 Chevrolet

P0404 - Exhaust Gas Recirculation Circuit Range/Performance

The EGR (Exhaust Gas Recirculation) system's purpose is to redirect exhaust gas back into the cylinders. Since exhaust gas is inert, it displaces oxygen and fuel, thereby lowering cylinder temps, which, in turn, lowers oxides of nitrogen emissions. For that reason it needs to be carefully metered into the cylinders (via the EGR valve) so as not to adversely affect the engine's performance. (Too much EGR and the engine won't idle).

If you have a P0404, then the EGR valve is likely an electrically controlled EGR valve instead of a vacuum controlled EGR valve. Also, the valve will usually have a feedback system built into it that informs the PCM (Powertrain Control Module) what position the valve is in; open, closed, or somewhere in between. The PCM needs to know this to determine whether or not the valve is operating as needed. If the PCM determines that the valve should be operating, but the feedback circuit shows that the valve is not open, this code will set. Or if the PCM determines the valve should be closed but the feedback signal indicates that the valve is open, this code will set.

Symptoms: There may be no symptoms of a P0404 DTC other than the MIL (malfunction indicator lamp) or check engine light. However, Exhaust Gas Recirculation systems are inherently problematic due to carbon buildup in the intake manifold, etc. This normal buildup can lodge in an EGR valve, holding it open when it should be closed. If this is the case, the engine may idle rough, or not at all. If the valve has failed and is NOT opening, then symptoms would be higher combustion temps and as a result, higher Nox emissions. But the latter symptoms aren't going to be noticeable to a driver.

Causes: Usually this code points to either carbon buildup or a bad EGR valve. However that doesn't rule out the following:
* Open or short in the 5 Volt reference circuit
* Open or short in the ground circuit
* Open or short in the PCM controlled voltage circuit
* Bad PCM (less likely)

Possible Solutions:
1. Using a scan tool command the EGR valve to open while watching the actual EGR position (it will probably be labeled "desired EGR" or something similar). The actual EGR position should be very close to the "desired" EGR position. If it is, then the problem is likely intermittent. It may have been a lodged piece of carbon that has since dislodged, or it could be a bad EGR valve winding that intermittently opens or shorts as the valve temperature changes.
2. If the EGR "desired" position is not close to the "actual" position, then unplug the EGR sensor. Check for a good 5 Volt reference voltage to the connector. If it doesn't show a reference voltage, repair an open or short in the 5 Volt reference circuit.
3. If there is a 5 volt reference voltage, activate the EGR with the scanner, monitor the EGR ground circuit with a DVOM (Digital Volt/Ohm meter). It should indicate a good ground. If it doesn't then repair the ground circuit.
4. If there is a good ground, then check the control circuit. It should indicate voltage that varies according to the percentage that the EGR is open. As it's open more, the voltage should increase accordingly. If it does, then replace the EGR valve.
5. If the voltage doesn't increase incrementally, then repair open or short in EGR control circuit.

Try it and tell us news., Then, about other code...


P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms.

Causes: A code P0420 may mean that one or more of the following has happened:
* Leaded fuel was used where unleaded was called for
* An oxygen sensor is not reading (functioning) properly
* The engine coolant temperature sensor is not working properly
* Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
* Retarded spark timing
* The oxygen sensors in front and behind the converter are reporting too similar of readings

Possible Solutions: Some suggested steps for troubleshooting a P0420 error code include:
* Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
* Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
* Inspect the downstream heated oxygen sensor (HO2), replace if necessary
* Replace the catalytic converter

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Basically you have any problem with the air system.

Keep us updated.

Posted on Sep 23, 2010

  • 520 Answers

SOURCE: My car "suffocates," when trying to accelerate.

fuel filter. and if that does not cure the problem then have the fuel pump pressure checked

Posted on Feb 06, 2011

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My 2001 camry stutters or what you call it when I take off im not pressing down hard once it reaches the right speed it is fine just when accelerating


Could be a dirty fuel filter,but with what you told me,Most likely will not accelerate on a hill because the EGR(exhaust recirculation valve)is bad.Replace the EGR.

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Very possible. If Egr is hung up it will idle rough and be very sluggish to accelerate but seem alot better on the freeway.

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Ok. I'll give you my best guess, although I am not a Dodge Stratus expert. Based upon your description of the problem, I am to assume that the vehicle has problems accelerating up to speed, but once there, cruises ok unless you are going uphill or need to accelerate quickly, then power falls off rapidly and acceleration returns very slowly. If that is accurate, I would suspect the EGR valve. This is because at ihighway cruising speeds the EGR valve is pretty much wide open, letting exhaust gases back into the intake. When you need to accelerate, pressing the accelerator results in intake vacuum drop. This is partially compensated for by closing the EGR valve. If the EGR fails to close or sticks partway open, the exhaust gases will lower intake vacuum even further, and rob engine power. This can also cause the onboard computer to force a downshift to the transmission, as vacuum sensors are used to determine engine loading and the need to reduce gearing. In addition, a partially open EGR valve can cause erratic idle as it affects static intake vacuum (EGR is normally closed at idle) and the onboard computer must continually compensate, resulting is unstable idling.

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Sluggish upon acceleration and blows black smoke


Replace the EGR valve. It shouldn't cost anymore than a few dollars to replace.

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Jaguar x type...started the car 2day when i put my foot on the accelerator there was no speed...i can put my foot all the way down and no speed its got no acceleration...its driving but slow...


if there is also black smoke coming out the exhaust - and the problem is intermittent - then it's the EGR valve - it sticks open - will need replacing.... Happened to mine this morning and this is what the Jaguar Assistance guy said. Mine is a 2006 2 litre X-type.

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2003 GMC Sierra is running rough. What can cause this problem? This problem just recently started and it occurs when I first accelerate from zero to lets say 25 or 30 mph. As I progressively increase speed...


Find the egr valve and with the engine running, disconnect the vacuum line attached to it. If the engine runs better then the egr valve is stuck open. Replace the egr valve. It is held in by 2 bolts and usually located at the front of the intake manifold. Usually dull gold in color and shaped like a mushroom.

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Why does my motor shake and get sluggish when i try to accelerate rapidly. there is also a loud popping sound associated with this


This could be anything and everything ,sorry no magic relay involved ,Biggest suspect is EGR valve but it could be anything so best advice is to take vehicle to dealer

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Acceleration problems replaced EGR valve, flushed


Sound like you have a plugged cat converter. The warranty is 8 years 80k miles. Have it checked first.

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Truck running sluggish


Replace the fuel filter and clean the MAF sensor with MAF cleaner. Just fallow the instrction to the MAF cleaner. The other thing to is the 1995 4.3 is know to have the EGR valve getting sluggish due to carbon build up. Remove the EGR valve and use Carb cleaner on it to remove the EGR valve and make sure it moves freely. Good luck and hope this helps. 

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