1096369

Hey Guys,

Just back from the salt mines! GOOD THING WORKING ON OLD PORSCHES, IS FUN!

I tried pulling the harnesses off both the AFM, and TPS and pulled the vacuum lines off the FPR and FPD, and the 2 off of the throttle body.... (One at a time.... and all at once), No soap.....

I even changed the COIL and FPR with no luck..... It still starts, and runs (and can even be driven), if you don't touch the accelerator, but when you do, it will stall, And not restart for hours.......

I don't mean to whine... but having a running car that I can't drives..... Is as frustrating as dating a super model.... Who you can't...............Well......... Kiss!!!

I have a new FPD on order, and will change that out..... But I guess I am going to have to drop some serious cash on a rebuilt DME and/or AFM.... Kinda getting to the point where nothing seems to be working.....

One thing I noticed today..... After my stall induced "time out" I pulled the harness off the TPS and when I cranked it, it did sputter and even started (sorta!) briefly, before returning to its obstinate mode.....

The only thing listed on Clark's for "stalls when coming off idle", is a vacuum line.... I checked for leaks, but no luck at the "J" boot, or other likely places.....
I guess new Vacuum lines aren't too pricy....

Sigh..... I think an adult beverage or two is in this newbies future......


Any Bright ideas???

Thanks!
Fred

1096369

I don't mean to be crass.... But like most ladies..... They do look nice when wet!




Just order this as a "screw it nothing seems to work plan....."

http://www.ebay.com/itm/111730623769

odonnell

The TPS may be bad. I know you said you guys checked it, but perhaps it's touchy when the car is on (engine vibrating)? If you're going to go 'shotgun approach' with buying parts, may be worthwhile. I know I made the offer before but I have several, I'll find a good one and send it out for the cost of shipping if you want it.

1096369

Hey S.H.
Yeah I always come back to the TPS, as the most likely offender..... To the degree that my 944 sensei, will wrap me in the knuckles with a wooden spoon, if I even think about it.... We have given it lots of attention..... But I will "Never say Never", with one of these machines....

If you do find a TPS you can part with, please mail it out....(just let me know what to send via PayPal!) I sorta feel like I have changed out everything else..... So why stop now!

I think that the new DME "may", be the thicket here..... Since nothing we have done, jumped, bumped, or yelled at, has made the slightest difference to this car.....

Hope springs eternal!
Thanks!
Fred

konakat

You should check for shorts in the TPS wiring. Disconnect the TPS and DME, then test for shorts at the DME connector.

mel_t_vin

Have you verified the condition/function of your ICV?

How thorough was the inspection of your vacuum lines/hoses? Have you checked both hoses going to/from the aforementioned ICV?

Edit: scratch my comments re: the ICV...I thought this was an '86. But my question about the condition of your lines/hoses stands.

1096369

Hey Konakat,

We have paid a lot of attention to the TPS.... But if My replacement DME does not fix this issue..... It is "back to the drawing board!" We really have done all the standard, and not so standard checks.... We just can't seem to shake loose whatever this evil, Gremlin is.... I think the fact, that after a stall, it will not start for hours, must be a clue to what this beastie is..... But damn if I can puzzle this one out.....

Time will tell!!!

Thanks!
Fred

1096369

Hey Guys!

Sigh..... Not having any luck with this problem..... I have tried the shotgun approach.... New DME, AFM, TPS, FPR, FPD..... And the damn thing still stalls and won't restart for hours if you touch the accelerator.....

The only small bit of hope.....with my buddy cranking it, (after a stall) and subsequent no start..... I moved the AFM to full open by hand, and got a restart..... But it idled like crap And would not replete the next time I tried it.....

Sigh..... We think it MUST be an electrical gremlin..... We have checked for vaccuum leaks and can't find anything out of place..... And it doesn't act like a vac. Problem when running at idle.....

I am not giving up yet.... But I admit..... I'm getting a bit dispirited trying to track this evil bitch of a ghost problem down, with nothing to work with.....

Any bright ideas????

Thanks!
Fred

1096369

well.... Maybe I'll just have to drive it around (in style!) at idle,
for the rest of my life!!!

odonnell

You said you did a fuel pressure test... what were the results? What numbers do you see at idle, with the vac line pulled off the FPR, and when you rev it?

Have you tried starting fluid when it won't restart?

If everything checks out on the fuel pressure side, just do a full standalone conversion and be done with it. No more playing games with Motronic no-starts and outdated hardware/tunes.

konakat

Did you check the resistance for the engine temp sensor at the DME connector? I know my engine just barely runs if I disconnect it. This is almost certainly an engine harness issue at this point, just have to find out where. The fact that it isn't intermittent makes things a little easier hopefully...

Humboldtgrin

Replace your DME temp sensor and you'll stop whining.

Tiger03447

It appears that the idle air control valve is working and letting the engine idle. Seems that the AFM is not opening to give enough air and the blade may be sticking to the point that the actuator is not able to open the blade. The problem seems to be in the transition between idle air and the open throttle air. There must be a resistance change somewhere since it takes several hours for things to cool off enough for a restart. How did the engine act, once you opened up the AFM blade while it was running? Did it continue to stumble and die, or did it run as it should? If the blade were opened up manually, and the engine died, then I would suspect a fuel problem...jus saying.

1096369

Hey Guys,

I don't know what the results of the pressure test was my buddy had to Jerry-rig his gauge to fit my fuel rail..... He did tell me it was within the normal range.

I will check the harness and temp. Sensor.... Can't hurt!

When I got the restart after stall, I had to open the AFM full to the left..... It ran like crap (running rough) but it ran.

After a stall it does kinda seem (and smells) like it is flooded..... We are thinking about pulling a spark plug after a stall and seeing if the piston is "wet" with a Q-tip or something..... We think it is getting fuel, and It runs so we know we got spark..... So I guess we gotta figure out if it is a electronic stall, or lack of air stall.....

I am Sorry if I am not describing my issues, well..... My buddy helps me where he can, but he has a life too.... Although I may handcuff him to my engine block till, till we solve this gremlin! This is an "on the job" learning experience for me, And I admit I am a bit over my head with this car. I promise to (try!) to keep my whining and crying to the bare minimum!

Thanks!
Fred

kevin12973

Just for the hell of it, check the white 9 pin connector to the left front of the brake booster. You may have some corrosion inside there. I did and after cleaning it well car has been great.