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Car Forum / Volkswagen / Water Cooled Volkswagen Cars / January 200899 Jetta Idling Crappy
I've got an intermittent issue with my 99 Jetta. It drives fine, but idling, it pulses from ~800RPM to ~500RPM (and sometime stalls). It doesn't happen all the time, but seems to happen more often when the engine is cold or there's an electrical load (headlights, loud stereo, power windows, etc). I've done a tune-up (oil w/ filter, top off fluids, spark plugs, wires, and distributer cap). I went to AutoZoo and PepNuts, and they suggested a bad ground or alternator/battery fault. I had them run a free check on the battery/alternator which turned up fine, but I replaced the alternator and drive belts anyway because I'm stubborn. Needless to say, it's still idling like poo and I don't know what to try next. Any ideas? :) -Dan BTW you did not mention which engine you have in this Jetta! I will assume you have a 2.0l but I don't know. what brand and type of spark plugs are you using? Engine check light on or can you scan the ECM for codes? MIght be the ign coil getting weaker. Or a dirty throttle body that needs cleaning and an adaptation done. I've got an intermittent issue with my 99 Jetta. It drives fine, but idling, it pulses from ~800RPM to ~500RPM (and sometime stalls). It doesn't happen all the time, but seems to happen more often when the engine is cold or there's an electrical load (headlights, loud stereo, power windows, etc). I've done a tune-up (oil w/ filter, top off fluids, spark plugs, wires, and distributer cap). I went to AutoZoo and PepNuts, and they suggested a bad ground or alternator/battery fault. I had them run a free check on the battery/alternator which turned up fine, but I replaced the alternator and drive belts anyway because I'm stubborn. Needless to say, it's still idling like poo and I don't know what to try next. Any ideas? :) -Dan It's a 2.0L GL and I've got Bosch 4+ plugs. I had the ECM scanned a while ago because of an intermittent check engine light and I think it gave a few errors about misfiring on multiple cylinders, which is why I replaced the plugs wires and cap. I'll check on the ignition coil and throttle body and get back to ya. Thanks! > BTW you did not mention which engine you have in this Jetta! > I will assume you have a 2.0l but I don't know. [quoted text clipped - 3 lines] > MIght be the ign coil getting weaker. > Or a dirty throttle body that needs cleaning and an adaptation done. >It's a 2.0L GL and I've got Bosch 4+ plugs. I had the ECM scanned a >while ago because of an intermittent check engine light and I think it >gave a few errors about misfiring on multiple cylinders, which is why >I replaced the plugs wires and cap. I'll check on the ignition coil >and throttle body and get back to ya. Thanks! When you check the throttle body, check the hose that goes from the TB to the MAF. If there is a crack in that hose, it will let in extra air and this will result in a crappy idle or no idle if you come to a stop after driving. IOW, the engine will die. This happened to me and was just a TB hose replacement.  SignatureJeeps and dubs and everything's nice... I vote you take those spark plugs out and install the dealer ones. Sorry but I have seen a few engine running problems due to just the spark plugs. If your engine has a distributor then your sparks plugs should be something like F8RS or FR8S. What plugs did you pull out? It's a 2.0L GL and I've got Bosch 4+ plugs. I had the ECM scanned a while ago because of an intermittent check engine light and I think it gave a few errors about misfiring on multiple cylinders, which is why I replaced the plugs wires and cap. I'll check on the ignition coil and throttle body and get back to ya. Thanks! On Jan 13, 1:00 am, "dave AKA vwdoc1" <vwd...@hotmail.com> wrote: > BTW you did not mention which engine you have in this Jetta! > I will assume you have a 2.0l but I don't know. > > what brand and type of spark plugs are you using? > Engine check light on or can you scan the ECM for codes? > MIght be the ign coil getting weaker. > Or a dirty throttle body that needs cleaning and an adaptation done. >I vote you take those spark plugs out and install the dealer ones. Sorry >but I have seen a few engine running problems due to just the spark plugs. If your engine has a distributor then your sparks plugs should be something like F8RS or FR8S. What plugs did you pull out? Agreed. The Bosch 4-prong plugs I've heard no good about. Don't have to go dealer exactly but at least get the dealer-equivalent at your local FLAPS. >I've got an intermittent issue with my 99 Jetta. It drives fine, but >idling, it pulses from ~800RPM to ~500RPM (and sometime stalls). It [quoted text clipped - 7 lines] >because I'm stubborn. Needless to say, it's still idling like poo and >I don't know what to try next. Any ideas? :) -Dan I'd also check all vacuum lines and connectors for cracks and leaks. Ok cool. Thanks for the tip! On Jan 13, 7:52 am, samst...@aol.com wrote: > I'd also check all vacuum lines and connectors for cracks and leaks. > I've got an intermittent issue with my 99Jetta. It drives fine, but > idling, it pulses from ~800RPM to ~500RPM (and sometime stalls). It [quoted text clipped - 6 lines] > because I'm stubborn. Needless to say, it's still idling like poo and > I don't know what to try next. Any ideas? :) -Dan I have a 2001 Wolfsburg 1.8T with the same problem, and if you troll the 'net long enough you'll see this is something Jetta users have reported consistently for several years now. I have taken mine to the shop 2x. Plugs replaced, Tune-up, lots of computer time and looking at sensors. Tonight, the thing barely runs and won't stop shuddering and lugging and trying to stall. It's also just started to smell (sort of a burning smell, but funkier). Back to the shop again. All I want to do is get it working and get rid of it. Let me know if you get a solution that sticks. >> I've got an intermittent issue with my 99Jetta. It drives fine, but >> idling, it pulses from ~800RPM to ~500RPM (and sometime stalls). It [quoted text clipped - 7 lines] >> because I'm stubborn. Needless to say, it's still idling like poo and >> I don't know what to try next. Any ideas? :) -Dan Is the Engine Check light on? vacuum leak maybe bad throttle body maybe Coolant Temperature Sensor maybe AND which spark plugs are you running? Some just like the factory ones! Makes a difference! ;-) > I have a 2001 Wolfsburg 1.8T with the same problem, and if you troll > the 'net long enough you'll see this is something Jetta users have [quoted text clipped - 5 lines] > do is get it working and get rid of it. Let me know if you get a > solution that sticks. Yours sounds like the catalytic converter is clogged. |
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