Rennlist - Porsche Discussion Forums - 968 Forum

ID this part?

Apex — Mon, 18 May 2026 23:47:51 GMT

Hey all - I recently had the AC recharged. And of course, shop lost one of the hold-downs for the front engine trim. 😠 Okay, big deal. Ordered some extras 'cause that part seems to always go missing.

But, found this little item in the front engine bay in front of the radiator. Anyone recognize it? It looks vaguely familiar but I can't place it. Ha - it may have nothing at all to do with a 968 in which case I'll delete this post.

😏 Good news is... AC blows cold now! Bad news... hate finding random parts bouncing around in the engine bay.

Appreciation for any input.

Does anyone have a extra left side air guide?

ForceReconTrojan — Sun, 17 May 2026 20:33:10 GMT

I would appreciate it if anyone has one to sell, mine is MIA.

Thanks

Tiptronic flex disk, reproduction

Marc1968 — Mon, 27 Apr 2026 07:13:33 GMT

We (small company) in Norway
are going to make a small series
Of refurbished flex disks,
The natural rubber ones degrade
Quickly and cost a fortune.
The degradation is caused by high temperature, oil vapour, and last but not least! by the produced ozone of the starter motor.

First cracks forming after 6 years.

Angle deflection testing under 305nm or ~225ft/lb

Splined shaft.
In consultation with and after extensive research with a plastics materials manufacturer, we have selected a better polymer.

The goal is to reproduce a long lasting
Solution with the same dampening characteristics for a much lower price.
Of course the refurbished units will
Be balanced to high specs after
Production.

We need a couple of worn out(rubber destroyed)
Flex disks inner and outer parts.
For further testing.
Pm me if you have those worn out parts
we have a shipping address in the Usa.

Pictures are from torque angle testing
of a 6 year old flex disk.

Standard Wheels?

bingjeep — Thu, 23 Apr 2026 12:16:42 GMT

I am purchasing a 1994 Cab and the window sticker states 17� Light Alloy Wheels, cost $1378. Pictured is what is on the car. Correct?

No start - Electrical Weirdness

senordude — Wed, 22 Apr 2026 04:11:52 GMT

I have been battling a no start issue with my �95 Cab MT for about 6 months. I bought the car last August and it ran fine for a month. I did see intermittent Air Bag warnings and an occasional Central warning light (!).
one afternoon the car died while driving and I have been unable to start since then.
I obviously replaced the DME relay with a known good one. The car cranks and the tach bounces.
i took the car to a certified Porsche mechanic in my small mountain town (i am 3 hours from Denver) He went through the normal no start checks like fuel,hall sensor, ground points, spark etc. He was unable to resolve. We were working off semi assumption that it was an electrical issue. The previous owner had stated in notes that he had an aftermarket alarm system removed during his ownership and the stereo replaced with the PCCM classic radio. He checked out wiring around the DME/ECU and the factory alarm system and any splices were terminated properly. He checked voltages at test points and all looked correct. We even sent the DME/ECU to ECUDoctors for them to test. They used my ECU in a donor car and it worked fine.

Once I got the car back in my garage I started to dig deeper. I purchased a Focus 9 Solid-state DME relay with the diagnostic led�s. The first thing I noticed was that none of the LED�s lit no matter what key position or during crank. Secondly I noticed that the Check Engine light did not illuminate (even briefly) with the key in the run position.
I started looking at all the wiring looms under the dash and wiring near the factory alarm to try and determine if there was some sort of immobilization that that happening left over from the aftermarket alarm. I discovered a non-OEM relay inserted in the path of the ignition switch. A web search on the manufacturer and part number told me that it was a leftover relay from the aftermarket alarm system. I removed the relay and patched the ignition wiring where it bridge the red 30 circuit. I was certain I had found the issue. But no. Same no start behavior.
Next I found a component that looked non-OEM and a search told me it was a remnant from an Indiglo dash hack. I removed it too. (It was not inserted anywhere close to the ignition circuitry. It was connected to the defrost light bulb circuit.)
I checked and verified that the ignition switch was operating as it should where each position had correct continuity to the appropriate pins.

Here is where it gets strange: I am verifying voltage at each socket of the DME relay socket because I wanted to know if it was getting 12 volts during crank. I made sure that port 30 had a constant 12v at rest with no key in the car. Next I checked to confirm port 86 energized when I had the key in the run position. I found that it was energized at rest. (No key in ignition) I removed the negative lead to my battery and checked for static continuity between 30 and 86 at rest. There is an obvious short there. Next I checked same at the G2 Ignition relay. It acted as I expected. That is, port 30 showing 12v at rest and 86 energizing only when the ignition switch was turned to run.

So my question to the experts is this: Is it abnormal for port 86 in DME relay socket to be energized when I have the ignition switch in position zero? Secondly, why are all the led�s on my focus 9 DME relay dark if I am getting 12 volts at pins 30 and 86. I would expect the yellow ignition led to illuminate the second I plug the relay into the socket if 30 and 86 are energized.

thanks for any insight or next step suggestions

1994 Porsche 968 � Intermittent Low-RPM Hesitation, random miss, and hard cold start

blu64 — Mon, 20 Apr 2026 02:14:38 GMT

First I want to apologize for writing a novel here, but I wanted to make sure I gave all the info.

TLDR: Idle, hard cold start and intermittent miss issue, with a ton of stuff already checked and replaced.

I�m chasing down a lingering drivability issue on my 1994 Porsche 968 (Tiptronic). The car runs well overall, but I�m dealing with an intermittent hesitation at low RPM and light throttle. It shows up most when pulling away from a stop or just easing into the throttle. Once you�re into moderate or heavy throttle, the car pulls strong and feels completely normal (usually).

At idle, when the engine is fully warm, there�s occasionally a slight fluctuation�maybe 25-50 *RPM (the work I have done so far has improved this, most of the time is is steady now)�but it is missing, it is random, not a hard miss that happens every time the engine rotates. It�s subtle, but it�s there. The issue tends to be more noticeable after heat soak, like in traffic or after the car has been sitting hot, but it�s not 100% consistent. The car starts quickly when it is warm, doesn�t stall, and doesn�t have any misfire behavior. It�s just this persistent low-RPM hesitation that hasn�t completely gone away. And the random miss.
One additional symptom: on a cold start (especially in colder weather), the engine initially feels like it�s running on two cylinders. If I shut it off, wait 10�15 seconds, and restart, it clears up and runs normally.

A lot of work has already been done on the car. The fuel system has been refreshed with a new pump, filter, and high-pressure line, and the injectors were recently cleaned and balanced. Ignition components including plugs, wires, cap, and rotor have all been replaced. The engine also had a full front service with timing belt, balance belt, rollers, and water pump. The coolant temp sensor has been replaced, and the alternator and battery are both newer.

More recently, I installed an aftermarket MAF. It was slightly oversized and needed to be sanded down a bit to fit the airbox properly. (purchased from 944online) After installing it, the car improved noticeably�idle smoothed out and the hesitation got about 85% better�but it didn�t completely resolve the issue.

I�ve done a smoke test and found several small vacuum leaks, which I fixed. That helped, and I think that I�ve found all the vacuum leaks as today�s smoke test didn�t reveal anymore of them. I�ve also checked ECU grounds and connector seating, and everything there looks solid.

The throttle position switch has been tested and is behaving correctly, with proper switching at idle and full throttle. Fuel pressure has been checked at the rail and looks good, and leakdown holds as expected.

The idle control valve has already been removed and replaced, so that�s no longer a suspect. Doing this also improved the cars idle behavior. Sometimes it is even running perfect. On Friday after installing the new idle control valve it ran perfect all day, smooth with no misses or hesitation. then began to miss again today.

what�s left generally falls into vacuum leaks, airflow measurement, lambda/O2 feedback, or fuel control issues. Today I went back over most of the things I�ve done, checking the new temp. sensor, distributor, rotor, plugs, wires, grounds, and more smoke testing, which revealed one last leak. (I Hope)

At this point, I haven�t replaced the O2 sensor, and I haven�t gone as far as pulling the intake manifold to inspect every vacuum line underneath it. The EVAP system also hasn�t been fully inspected yet.

What I�m trying to figure out is where to focus next. The car is clearly much better than it was, but something is still slightly off. I�m wondering if this pattern points more toward a small remaining vacuum leak, an aging O2 sensor that�s slow to respond, or possibly inconsistency from the aftermarket MAF. Or something that I�ve failed to even consider. I'm starting to feel like I'm chasing my tail and getting nowhere.

If anyone has run into a similar �mostly fixed but not quite� hesitation on a 968, I�d be interested to hear what finally solved it. I�m especially curious about common vacuum leak points that are easy to miss on these engines before I commit to pulling the intake apart.
Also one last thing: there are no currently stored fault codes.

Coolant tank options?

islaTurbine — Sun, 19 Apr 2026 19:25:41 GMT

It appears that the 968 coolant tank is NLA. Is this a recent development?....I can't seem to find any threads on the topic.

Regardless, what are folks doing in response? Will a 944 tank (Porsche part number ending in -06 instead of -08) work instead?