apw964

All,

Some of you may recall that I had my engine rebuilt about a year ago after a failed distributer belt. Unfortunately after performing a leak down tests 8,000 miles later my 5th cylinder was showing 80% leakdown. The garage that performed the original engine rebuild were gracious enough to honor a free rebuild. The car has been in the shop for several weeks now and the culprit for the high leakdown was a miss aligned valve seat on the exhaust port.

The engine has been put back together and the engine placed back in the car, but unfortunately when the car has warmed up the car suffers from fuel starvation. The mechanic has been trying to track the source of the problem now for nearly 2 weeks and it's driving me crazy not having the car...

can anyone help, so far the mechanic has checked;

1. All Grounds
2. Replaced the O2 Sensor
3. Replaced the temp sensor
4. Run a Fuel Pressure test
5. Checked the injectors

Non of the above has resolved the problem. The problem didn't exist before the rebuild....

Anyone got any ideas what to check next ??????

Thanks in advance,

Andy

Kevin

Sounds like they hit the crankshaft position sensor. It is easily damaged. Does the car surge and die? Check the sensor...

Bill Wagner

Andy:

I don't think your mechanic should just start replacing components without first finding out if there's something wrong with them.

On my far from complete web site is a list of troubleshooting items taken right out of the manual. Some of them are common sense (like grounds) and others identify specific components.

If it was my car I would select which symptoms match yours and then focus on the items that are most likely to fail.

To see the list, click on the link below:

<a href="http://members.rennlist.com/billwagner/ByProblem.html" target="_blank">http://members.rennlist.com/billwagner/ByProblem.html</a>

It's only a list. I haven't had time to work on the site for about the last two months, but at least it's a list of things to check out.

<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Adrian

Dear Andy,
Please explain what you mean by "fuel starvation" and how you came to this conclusion. You know the circuit is very simple. Fuel tank, fuel pump, fuel filter, fuel manifold, fuel injectors. Pressure test by the way only checks fuel pressure it does not confirm flow. I would suggest a crimped or kinked fuel line.
I agree with Bill do not do component changes until you have done some serious detailed visual inspections. I would also check the fuel filter. You also have to in a general way look at what does "checked actually mean" when you mechanic says he checked it. Did he remove all the injectors and check the spray pattern. Has the pulse been checked. Finally is it a case of not enough fuel or a case of TOO MUCH air. An airleak can cause similar symptoms.
Ciao,
Adrian
911C4

PS: It would not be the first time that the DME (this is what Porsche call the throttle body assembly as well for some reason) was damaged upon re-installation. Cracked, pieces not connected and do not forget the little old dipstick.

apw964

Hey Guys,

Thanks for the feedback so far. I will be heading down to garage today or tomorrow hopefully. I have not heard the car run or been in the car to experience the problem yet - unfortunately the garege is 60 miles away (it's a long story).

I am not too concerned that the garage are replacing items - I'm not paying for them :-)

I'll get some more detail and let you know

Thanks so far,

Andy