Question about 2002 Volkswagen GTI

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Car runs lumpy

Engine does not run smooth when idling.have changed sensors and switches and had the coolant system checked.been hooked up to various computers but no fault found.any suggestions.cheers

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  • redsheep Jul 08, 2008

    any info no matter how small is appreciated

  • Richard Raynor May 11, 2010

    Hi, Really need to know engine type / code. If it is a TDI it could be the crankshaft pulley coming loose on its keyway, allow the timing to vary.

    Which engine is it, and any other symptoms like coloured smoke?




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GTi didn't have a TDi. Start with the simple things...plugs/wires, fuel filter. Good test is to use a set of insulated pliers to remove plug wires from plugs while the car is idling, one by one. Listen for a change in RPM. Will lead you to the right cyl if it is a wire/plug/inj. problem. Good luck...

Posted on Nov 10, 2008


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My 88 chevy truck 350 idles high whats wrong with it i replaced the temp sensor that should have fixed it

You will need to restore some of the vacuum lines. The information about the coolant sensor is correct. I usually work on Ford family brands, but in general, some vehicles have 2 coolant sensors. One is for the engine controls and the other works the dash gauge for water temperature.

You need to see if the sensor you replaced went to the dash. If the sensor is working and warm, if you unplug the sensor and it goes to the dash, the dash gauge will drop to cold. If it does not(while the engine is running), then you have the engine management sensor. The engine management temperature sensor is the one you want to replace.

Several ways the engine can idle high. If the "cold start" system does not get a warm signal, it will stay set for "cold engines". Sometimes the water sensors are built into the Vacuum system. When the water valve changes due to heat, the Vacuum switches and the idle is reduced because Vacuum is rerouted.

If some of the Vacuum lines are gone, then some parts may not work. The air pump will make the engine run more efficient. The catalytic converters may clog without an airpump.

Some engines need a signal from the Catalytic converter (O2s) to set idle and fuel mixture. So the engine can not adjust itself if you remove the catalytics.

Check for Vacuum leaks in the Intake manifold with a spray bottle of water along the seams while the engine runs. A open gasket is like cracking the throttle open. It will speed up the engine.

I hope my information is useful to you.

Mar 03, 2012 | Chevrolet 1500 Cars & Trucks


Bad fuel economy and lumpy idling - possibly causes

<p><b><u><span>Excessive fuel consumption and 'lumpy' idling engine</span></u></b><br /> <p><b><span>Possible faults:-</span></b><br /> <p><b><u><br /></u></b><br /> <p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the time, not just at start up, causing ECU to set longer injection cycle </span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant temperature</span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation and perhaps prevents the engine from achieving normal running temperatures.</span><br /> <p><span> </span><br /> <p><b><u><span>FPR</span></u></b><span> - broken diaphragm allows fuel to enter the vacuum line and then into the inlet manifold. Additional source of fuel makes the fuel air mix richer causing a faster and lumpy idle.</span><br /> <p><span> </span><br /> <p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal from O2 sensor causes ECU to set longer injection cycle.</span><br /> <p><span> </span><br /> <p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error causes ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br /> <p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air entering causing ECU to set longer fuel injection cycle </span><br /> <p><span> </span><br /> <p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

My cadillac deville(2001)runs smooth,but it runs hot.what is the problem?

Insufficient or weak coolant, bad thermostat (out of range), cooling fan not running or kicking into 2nd phase with A/C on, bad temperature sensor, bad temperature sending unit.(false guage reading).
Start by checking your coolant level and color (nice and green or orange? not rusty looking?) if rusty looking, flush coolant system and refill with recommended coolant type of 50/50 mixture.

Check specific gravity of coolant to see if the mixture is weak.

Verify cooling fan is kicking on after engine reaches operating temperature with engine idling.

Replace thermostat.

Measure resistance of temperature sensor. (should slowly raise as engine heats up)

Measure voltage at sending unit. (should slowly raise as engine heats up)

One of those should solve it, I always lean toward weak coolant and bad thermostat. I have seen bad water pumps do that too.


Jun 14, 2011 | 2000 Cadillac DeVille

2 Answers

2000 honda odyssey, sputtering and pinging, hesitating, check engine light w/ tcs light.....???

The following is from the Honda Odyssey (1999-2004) Service Manual page 19-81:

"When the Malfunction Indicator Light (MIL or check engine light) and the Traction Control System (TCS) light are both on at the same time, you should troubleshoot the Programmed Fuel Injection (PGM-FI) system first."

"The TCS indicator will come on if one or more of the following components are faulty:
heated oxygen sensor, manifold absolute pressure sensor, crankshaft position sensor, engine coolant temp. sensor, throttle position sensor, top dead center sensor 1 or 2, intake air temp. sensor, exhaust gas recirculation, barometric pressure sensor, idle air control valve, VTEC pressure switch, knock sensor, fuel supply system, automatic transaxle, and misfire detection system of the PGM-FI system."

Most major auto parts stores have a code reader that will read out your diagnostic trouble codes or DTC's that are stored in the car's computer when the MIL comes on. They will do it for free. With these codes, you can narrow down what is wrong. This is good information to have if you are dealing with a mechanic or dealership. The terminal to hook up the code reader is under the driver's side dash about in line with your right shin.

Feb 01, 2011 | 2000 Honda Odyssey

1 Answer

Replaced thermostat, radiator on it, still over heats after about 15 minutes on idle.. Fan never seems to change speeds and idle jumps at higher temperature. Any Ideas?? Thanks!

When engine running, ensure no engine combustion gas bubbles in coolant resevoir (if so, the head gasket is blown).

Check radiator cooling fans are operating ok (as required when car warms up) - if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check for collapsing (soft) coolant hose on suction side of waterpump when engine revs above idle.
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary,
Check radiator cooling core is not blocked internally or externally.

Jan 17, 2010 | Ford F-150 Cars & Trucks

1 Answer

Uneven running of engine


Aug 31, 2009 | 1993 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

Lumpy idle when starting it in the morning, but runs and idles fine once reaches normal engine tempature.

Possible leaking injector(s), leaking head gasket so there is water in a cylinder overnight, or coolant temp sensor reading colder than actual temperature, which would induce a flooded condition. Narrowing down the possibilities can be accomplished by asking these questions: Does the coolant level stay the same, or has it gone down? Is the check engine light ever on? How many miles are on the fuel filter, spark plugs and other regular maintainance items? Fuel is in high demand on a cold start(filter). More fuel easily shorts out a bad spark plug. Too much fuel floods an engine and causes it to run rough or die if it even starts(coolant sensor/leaking injector). Feel free to contact me with more info. Thank You.

Aug 29, 2009 | 1993 Cadillac Eldorado

1 Answer

Olds alero 2.4 idle fuel pressure

most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Dec 10, 2008 | 1999 Oldsmobile Alero

1 Answer

1991 dodge colt won't idle when engine is cold.

probably oil, it may be too thick when it's cold but once it warms up it liquefies and your engine runs smoothly. you could try changing oil, I'm guessing if you have a high performance oil the chances this is the problem may be greater since high performance things are usually geared towards working well when everything is hot

Jun 29, 2008 | 1991 Plymouth Colt

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