944S2 Running Terribly!

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jeffcoseo - 10 Jul 2004 03:18 GMT

My 1990 944S2 has been perfect for my two years of ownership. It has 140k
miles and runs strong every day. I started it last week and it
immediately stalled. Started fine again, coughed, then stalled. If i'm
heavy on the gas, I can keep it running for a while. Then it will drive
and accelerate, but continues to hestitate, cough, sputter. It is barely
driveable. Please help! I have no idea what to do!

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william_b_noble - 10 Jul 2004 03:35 GMT

step one - check the timing and make sure you haven't slipped a tooth.
Presuming that's ok, you can pretty much rule out the DME, I think, and the
associated sensors - I'd personally check fuel pressure next and look for a
fuel related problem. just a guess, mind you

> My 1990 944S2 has been perfect for my two years of ownership. It has 140k
> miles and runs strong every day. I started it last week and it
> immediately stalled. Started fine again, coughed, then stalled. If i'm
> heavy on the gas, I can keep it running for a while. Then it will drive
> and accelerate, but continues to hestitate, cough, sputter. It is barely
> driveable. Please help! I have no idea what to do!

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jeffcoseo - 10 Jul 2004 16:34 GMT

Is there an easy way to check the fuel pressure? What should it be?

I tried unplugging one fuel injector, as mentioned in the other post, but
3 cylinders doesn't make the car run very well.

How would I check the DME relay?

Many THanks!

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Martin? - 10 Jul 2004 19:06 GMT

>How would I check the DME relay?

Locate the relay in the fuse box, remove it, connect pin 30 (careful always
on directly connected to the battery) to pins 87 and 87b, you should hear
the fuel pump run. Start the car, if it runs OK then the relay is faulty.
Remember to disconnect when engine is switched off.
If you haven't got replacement relay, you can connect pins 87 and 87b to one
of the fuses which is turned on with ignition, e.g. the auto transmission
one
(even if you haven't an auto).
Regards,
Martin

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Rhadamanthus - 10 Jul 2004 21:22 GMT

> step one - check the timing and make sure you haven't slipped a tooth.
> Presuming that's ok, you can pretty much rule out the DME, I think, and the
[quoted text clipped - 6 lines]
> > and accelerate, but continues to hestitate, cough, sputter. It is barely
> > driveable. Please help! I have no idea what to do!

I recently had a stall at start up issue.. if I kept the gas to it
till run it would run, but the idle would drop every time I was
driving and dis-engaged the clutch.. may be a different problem, but
my culprit was the #4 gasket on the intake manifold. starts right p
and runs like a champ now.

-Rhad

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Jack D. Russell, Sr. - 10 Jul 2004 12:52 GMT

======================================================================
* Reply by Jack D. Russell, Sr. <jackru$$ell2@notmail.com>
* Newsgroup: alt.autos.porsche.944
* Reply to: All; "jeffcoseo" <jeffcoseo@hotmail.com>
* Date: Fri, 09 Jul 2004 22:18:59 -0400
* Subj: 944S2 Running Terribly!
======================================================================

j> My 1990 944S2 has been perfect for my two years of ownership. It
j> has 140k miles and runs strong every day. I started it last week
j> and it immediately stalled. Started fine again, coughed, then
j> stalled. If i'm heavy on the gas, I can keep it running for a
j> while. Then it will drive and accelerate, but continues to
j> hestitate, cough, sputter. It is barely driveable. Please help!
j> I have no idea what to do!

Start by looking for a broken or disconnected vacuum hose. Check the
DME relay. Try unplugging one fuel injector. If it smoothes out, you
need a new FPR.Good luck.

Signature

Jack

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944Houston - 21 Jul 2004 21:53 GMT

Most common problem is the DME relay. Easy to just replace the DME relay
for $25.00.

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JEM505 - 24 Jul 2004 04:49 GMT

check the wires on the mass air flow sensor for poor contacts.use a
meter to check for variable resistance on back of sensor,it should rise
and fall when door opens and closes.also check your fuel pressure.

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