Trek Jetta is stalling out.
Posted: Oct Tue 28, 2014 7:18 pm
1996 Jetta 2.0
Brand new MAF, plugs, wires, cap, rotor, air filter, battery, and fuel filter.
The Jetta has been stalling at an idle lately and it is very odd. I was able to recreate the stall today by turning on the headlights and heater fan at the same time, dropping the idle below 700 and killing the engine.
Did some research and decided to clean the throttle body. After cleaning thoroughly I noticed a slight increase in RPMs at idle, but nothing major. I was unable to stall the car again by causing a voltage drop.
Threw a voltmeter on and watched it as the car idled to a stall. No drop in voltage until the engine stalled, ruling out a voltage regulator/alternator problem. Starts with 12.5v, charges at 14+v, stalls and drops to just below 12v.
I had a few miscellaneous codes leftover from before the tune up and new MAF, so I cleared them and in about 50 miles of driving today the CEL never came back.
Sprayed down the vacuum lines and couldn't find any issues whatsoever.
The car refused to idle a few weeks ago so I replaced the MAF with a cheap one from the internet and it still threw a code so I just replaced it with a new Napa one and it corrected the problem to an extent but it's still stalling.
With the MAF unplugged last week it would run great, and now with it unplugged I can't get it to stop stalling.
Next thing to try would be the coil I guess. Anyone in Bozeman have a MK3 these days that we could swap coils on to test it?
Anyone...Bueller? Bueller? Bueller?
Brand new MAF, plugs, wires, cap, rotor, air filter, battery, and fuel filter.
The Jetta has been stalling at an idle lately and it is very odd. I was able to recreate the stall today by turning on the headlights and heater fan at the same time, dropping the idle below 700 and killing the engine.
Did some research and decided to clean the throttle body. After cleaning thoroughly I noticed a slight increase in RPMs at idle, but nothing major. I was unable to stall the car again by causing a voltage drop.
Threw a voltmeter on and watched it as the car idled to a stall. No drop in voltage until the engine stalled, ruling out a voltage regulator/alternator problem. Starts with 12.5v, charges at 14+v, stalls and drops to just below 12v.
I had a few miscellaneous codes leftover from before the tune up and new MAF, so I cleared them and in about 50 miles of driving today the CEL never came back.
Sprayed down the vacuum lines and couldn't find any issues whatsoever.
The car refused to idle a few weeks ago so I replaced the MAF with a cheap one from the internet and it still threw a code so I just replaced it with a new Napa one and it corrected the problem to an extent but it's still stalling.
With the MAF unplugged last week it would run great, and now with it unplugged I can't get it to stop stalling.
Next thing to try would be the coil I guess. Anyone in Bozeman have a MK3 these days that we could swap coils on to test it?
Anyone...Bueller? Bueller? Bueller?
Sounds an awful lot like a cracked or failing ignition coil. Hope you can source a local one...new ones run $110 or so.