My 98 Saturn SL2 stalls often, but not always. It started a few months ago when it seemed to stall after it had been idling for a while. The stalling stopped for a while for a few weeks but suddenly started stalling more frequently, and inconsistently. Thought it might be related to engine temp, but it stalls even when the temperature is at 1/4. Sometimes, will run fine for a day or two, then stalls 4 times within 10 minutes, especially AFTER highway driving. It has stalled on a highway, but only once. Usually only stalls when I am going under 30mph or idling. The diagnostic code reads P1635. First I had the throttle body and AIC cleaned, then the coil packs and ignition module cleaned, checked the wiring, then replaced the crank position censor, and then replaced the ignition module. Please Help. I am desperate!!!!!!
I had a problem with starts on my 98 sc2, did it twice only, but it would start up, shake a bit then shut down like it wasn't getting fuel, or a wrong mixture. Replaced the coolant temperature sensor and starts / idles like new now... goodluck
DTC P1635
The 5 volt reference circuit provides a signal voltage to the linear
EGR, MAP sensor, and TP sensor. The return line is grounded through the
PCM. DTC P1635 detects a short to ground in any of the 3, 5 volt
reference circuits or inside the PCM.
Conditions for Setting the DTC
Important
The 5 volt reference is monitored whenever the ignition is ON.
DTC P1635 will set if the 5 volt reference signal is below 3.5 volts or
above 5.5 volts. This voltage is monitored internally by the PCM.
Diagnostic Aids
If DTCs P0563, P0108, P1106, P0452, P0453, P1122, or P0122 are set, a
short to B+ on the 5 volt reference circuit is probable. If the short
exists while attempting to diagnose, PDT communications will be lost
and driveability conditions will exist.
This code always has another code set with it stick to that code it will leed you to the problem say po122 and p1635 p0122 throtle position code you need to ck tp sencer and the 5volt connection to and from the sencer most likley a bad sencer
May have to check inside fuel tank for obstruction test the fuel pressure at all times while driving
That's what it looks like.
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Forgot to mention that it sometimes bucks before stalling, or even bucks without stalling.
But there has to be some electrical issue with it. It gave me a check engine light with a P1635 code.
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