944s2 randomly dies out while driving and at idle
 

A few weeks ago I was driving my 91 944s2 and noticed it had stalled while driving, I pulled over and restarted it it, and continued on my way. After about ten minutes of driving the car stalled out again at a stop sign. The car felt like it was firing on one cylinder and then just stalled. I instantly turned the key off and restarted the car. The problem stopped for a week or so and now the car stalls to much to drive.

I put a fuel pressure gauge on the fuel rail and the car has around 50 psig even when the car stalls.

I changed out the speed sensor, o2 sensor, icm sensor.

I don't feel like the dme relay is the problem but if anyone out there has ever had a problem like this i could really use the help to get my baby back on the road.
http://forums.pelicanparts.com/uploa...1373839636.jpg

I was having a similar problem with my 86 NA. It died while idling, often while steering the car through a corner. Sometimes it would start quickly, sometimes it would take minutes of cranking to run. When running, it seemed fine. It got to where it would die 3-5 times a week (driving 6 hrs per week).

I ended up doing two things at once, but I'm convinced that it was the speed and reference sensors. A new clutch had been installed a few months before this started happening. The mechanic had told me he hand some trouble with the bell housing and ended up changing it for one he had on hand.

I replace one sensor that had been ground on the flywheel. The other had a brittle wiring harness. I used sugru to patch the connector at the wiring harness (top of engine near the firewall). The car runs like a champ again. It has not stalled out in 3 months since.

The other thing I did was replace all of the vacuum lines (expect the one under the intake manifold).

The s2 only has one speed sensor back there it was the first thing i changed out because the connector fell apart and i figured it was just burned up. The car only has 83 thousand miles. This gremlin is killing me i am bidding on a ecm on ebay right now praying that is solves my problem.

I used to have an S2. It was a fun car to drive when everything works.

While driving, look at the battery voltage. If it drops below 12 volts, that could be your problem.
Clean and tighten all the ground points especialy the ones in the bellhousing
Clean and tighten the positive cable from the alternator to the starter and from the starter to the battery. Disconnect the battery negative cable when you do this.
Clean the battery terminals.

I had the same problem with my 91 S2 last year and changing the fuel filter seemed to fix it.

Oh and REALLY NICE CAR!

I have noticed the needle right at 12 volts I will check the grounds, I also have a new fuel filter to install, and have a new dime with pro max upgrade on the way hopefully this fixes the problem. I picked this car up super cheap she is a blast to drive, she takes clover leafs at 75 with the coil overs and 968 sway bars :)

While idling it should read at least 13.5 volts.
Check the battery voltage with a voltmeter while idling.

i cleaned the grounds now the car reads 14 volts inside the car and 13.5 or so on the multimeter. I took the car for a test drive all seemed well till it started cutting out again. But this time it did something different, I was able to get the car to drive at a quarter throttle but any more and it would cut out ?

Glad to see that you are getting some help here.

This must be kyle lol ?

Yep. I try to hang out here when I get the time.

Try unplugging clean the connector and replugging the AFM.

I have the same problem and not found a cure yet, although it only seems to happen when the ambient temp is very hot

I have a new dme on the way, I am also going to test my afm tonight the connection looks good kinda hard to clean but i have ran a wire brush over it. I will pick up some electrical cleaner tonight.

just tested the air flow meter it read good and so did the air temp sensor.

Why do you not think the DME relay, which normally causes this problem, is not the problem?

Its funny the other day i jumped the dme relay to just to test it out. The car still died out after about ten min of running. I am about to mess with the throttle position sensor. I was looking around online and apparently the s2 throttle position sensor is good for 100k or less before they take a ****.

I keep a paper clip that's bent in the shape of a jumper for the DME relay in my glove box. Never know when you might need it.

i always keep safety wire with me, tends to come in handy quite often. Now i have noticed oil in the spark plug holes i cleaned them out and looked at the spark plugs. The plugs look old. The car ran for about an hour before it started to idle really low and when you gave it gas it would rev up and when it dropped it would fall to about 100 rpm then jump back up. it seems to be an ever changing gremlin.

I hate that. Sometimes it is more than one problem.

What happens if you keep the RPMs up, will the car still die? For example, does the car die while you are still driving it, like at 3000 rpms? Or does it only die once it goes back to idle?