95 993 just will NOT start. NEED HELP PLEASE - Page 2

imprezkid · 07-12-2007, 01:11 PM

Were to the point where were gunna order the pulse sender, where does this go on the car?

rboylan · 07-12-2007, 01:26 PM

Drivers Side Intermediate Bell Housing. Contact me if additional information is needed.

Rich

imprezkid · 01-07-2008, 10:26 PM

Well one more thing is checked off the list. So now we have replaced:
DME relay
fuel pump
fuel filter
pulse sensor

Some more questions: We have had battery's in and out of the car, could this cause a problem?
We no longer have any form of remote, only a metal key?
What controls the spark?
All this happened after the battery went dead one time, could this have knocked out the dme control unit?
Is there a way to jump the coils, like the same way we jumpered the fuel pump to test it?
thanks a ton guys

4kb · 01-08-2008, 05:22 AM

This problem has been going on so long, if I were you, I'd just take it to your dealer so they can do a professional job. Replacing parts is certainly not fixing your problem. Just my suggestion.

rgdalacrity · 01-08-2008, 08:31 AM

Just borrow a control unit from someone with the same car to test yours. I did this with someone elses control unit to rule it out. Helping each other is what it's all about. I'm sure someone in your area has the same 993 model.

imprezkid · 01-08-2008, 05:08 PM

We actually did this, talked to a guy that owned The campus garage in ames iowa, who worked on porsches, he said he didn't even wanna know what we had done or knew, he said he'd work on it and figure it out himself. We had the car hauled 4 hours away, when it got there the guy said you're not dropping that off here. I guess sense it was missing the bumpers it wasnt pretty enough, so yeah a very expensive little trip to get f*****.

Anyway i live in southern iowa, there is only 1 993 in town which is a 97 mt, ours is a 95 auto so i don't imagine that would work and we don't know him at all.

Does anyone know of any respectable shops in the midwest preferably iowa region.

DW SD · 01-08-2008, 05:30 PM

Imprez-
I don't think the '95 has driveblock (98% certain). It is only the later 993 engines. You need to find a way to check that the DME (computer) is working and that the igniter is working (this turns the computer generated signal into a higher current signal which will drive the ignition coils. It is an amplifier of sorts.

First question: 1. Does your new fuel pump turn on under cranking? If so, it is likely the DME computer is working. The computer actually triggers the fuel pump (via stage two of the DME relay) under cranking once it sees motion from the crank position sensor.

If the computer is working, then it seems your igniter is likely bad. It could easily be an intermittent problem and might be sensitive to low voltages.

It would be nice to help you diagnose the problem as opposed to simply swapping parts.

Doug

imprezkid · 05:53 PM

I agree very much with you about diagnosing the problem.
The fuel pump does turn on while cranking the engine, it seems as the fuel injectors are not functioning?

We have 8 993 manuals but its hard to diagnose with them without the correct tools. But we can do some work.

DW SD · 06:13 PM

Well....maybe we can use the most simple tools. The computer should be turning on the fuel injectors.
Next question:
1. After cranking, can you smell any unburned fuel from the exhaust? Don't be shy, stick your nose up to the exhaust. Raw fuel will be obvious.
2. A secondary to # 1 (and cheap test) could be to buy an injector test light ($10 at NAPA). You should see it flash. This would confirm the computer is pulsing the injectors.
3. Can you tell if the fuel pressure regulator is opening and closing (it should be letting fuel out of the fuel rails to be returned to the tank)? It is on the left rear of the engine, attached to the fuel rail. A helper can feel the valve open and close. It should cycle once or twice a second. Or do you have a way to confirm fuel pressure - there is a test port on the injector rails.

Let us know the answers.

Doug

DW SD · 01-08-2008, 06:12 PM

Did you already confirm that you have spark? I like to use a spark plug and attach it to the output of one of the coil wires (wire from coil to distributor). I use a jumper wire (alligator clip on each end) and properly ground the plug. Find a good ground location and crank. Make sure on raw fuel is near.

Do you get spark? If so, this would rule out the igniter.

Don Settergren · Don Settergren's Garage

imprezkid: What's up with your 993?

imprezkid · 04-28-2009, 10:30 PM

Sorry for the late response guy i haven't seen the notices on my emails. I will check what you have listed, and give you some more feedback asap. The car is about 2 hours away at a supposed porsche dealer in cedar rapids iowa. who has told us they are baffeled the car is throwing no codes but will not run, this will be the third shop that has let us down now(we believe that they don't put much effort forward as the car is not very pretty at the moment, no bumpers, etc), and that we need to come pick it up, all this after we called them after 5 months of having the car and they told us they lost our number

. Anyway i will go pick up the car sometime next week and bring her back home. I'll let you guys know what i figure out.

p.s. after dealing with a non running 325e myself and cousin feel alot more confident on diagnosing the problem with the 993, a reason that we will try to fix the car once again instead of sending it right off again.

thanks again guys for helping me, its been a long haul and i've been busy with college so not much is done over those times of the year, but i am done next week and it is #1 on my list

porsche101 · 08-27-2009, 11:04 AM

Sounds to me like you got a bad crank sensor. Its on the fly wheel. You will not get any spark if thats not working hopefuly that helps

imprezkid · 08-27-2009, 03:46 PM

We have actually already replaced that thinking it was the problem. Currently we have the fuel pump off, it was not working as it was gummed up by bad gas, so we are in the process of sorting all that out, drained all the gas, probably now have to check the injectors to see if they are clogged. I'll check again to see if we have spark, i didn't think we did but we'll see

ischmitz · ischmitz's Garage

wow - this is one of the longest going stories for a no-start condition. I hope you sort it out. If you have replaced the crank sensor and have gapped it correctly you should see spark and the second stage of the DME relay (fuel pump) switching on once you crank.

I assume you know that gapping the sensor is critical. Some glue a penny to the sensor and mount it touching the teeth. Then knock the penny off and the gap is just perfect.

Good luck and keep us posted on progress,
Ingo

silver911rdb · silver911rdb's Garage

I had a problem with my 993 engine (installed in a 1974 911S). The engine was flooding itself when it was shut off which caused a hydro-lock condiiton. Story is that Porsche had a recall for the 1995 Porsche 993 for defective engine wiring harnesses. The insulation would deteriorate and cause any exposed wires to short out. It caused some really strange condiitons including keeping the injectors open even though the car was shut off. I also couldn't shut the car off at times. We'll after trying to diagnose the problem to no avail I started to tug on some of the wires and harnesses to see if I had a bad connection or short. As soon as I started tugging on the engine harness a heard a ton of relays start clicking. At that point I figured I had a problem with a short in the engine harness. It looked fine to me. I decided to split the rubber outer casing. I was amazed to find everything inside was shorted out. Check out the attached picture of what i found. You may want to see if your car had the updated engine harness installed.
Hopefully this helps

imprezkid · 12-27-2009, 08:05 PM

okay well an update, and to be honest we haven't been working on the car much, but i got it back in the garage and started tearing into it a little, my concern was that since the fuel pump was stuck that that whole fuel system looked pretty bad, and my concerns were valid, so at the moment half the intake is off and i'm trying to get the rail(s) out, which is being more of a job than i thought, if anyone has done this and knows the trick let me know, its like they are attached together and so everything has to come off so they can just come up.

I haven't been able to check the ignition lately as i'm too concerned with all the fuel, although its so bad it probably wouldn't burn, but ill let you guys know when i have more to update.

So as of now were working on replacing the fuel rails and injectors and the pump(again)$$$

993TT & 996TTS · 12-29-2009, 02:45 AM

I had a similar problem on a 993TT. Turns out it was the ECU. Mine was the early non flashable ecu that had a "piggy back" chip inserted into its board. When the guy I sold my old ecu to for scrap removed this it worked perfectly.

If you think anyone has flahsed your ECU or even if they have not it might be worth a try. My symptons were everything was fine other than no spark or fuel.

imprezkid · 12-30-2009, 09:01 AM

Does anyone know what you have to take off to get the fuel rails off?

CliffBrown · 01-07-2010, 12:43 PM

Quote:

Originally Posted by imprezkid

okay well an update, and to be honest we haven't been working on the car much, but i got it back in the garage and started tearing into it a little, my concern was that since the fuel pump was stuck that that whole fuel system looked pretty bad, and my concerns were valid, so at the moment half the intake is off and i'm trying to get the rail(s) out, which is being more of a job than i thought, if anyone has done this and knows the trick let me know, its like they are attached together and so everything has to come off so they can just come up.

I haven't been able to check the ignition lately as i'm too concerned with all the fuel, although its so bad it probably wouldn't burn, but ill let you guys know when i have more to update.

So as of now were working on replacing the fuel rails and injectors and the pump(again)$$$

You might save a lot of time and just replace the fuel filter, then open a downstream line at the end of the fuel rail and see if you can get fuel while cranking. Make sure to have someone stand-by with a fire extinguisher.