I have my car at the shop of a friend he is tring to help me fix my long on going issue of not starting as in the past threads.

Well here is what we have now, the car will start but when you try to eccerate the engine is seems restricted like a bad fuel filter or weak pump.

Can some one who knows the pressure of the pump in P.S.I 's instead of Bars tell me what the P.S.I. pressure should be for my car it's a 86 32 valve 928
5.0L. I have a little less than 35 now?

That will help us somewhat I think. Also if anyone knows best priced area for a new filter and possibly the pump I may need them both, the car will start and run but has no thrust or power. We have checked all of the dampers pressure regulator and no leaks, no vaccume leaks known or found, injectors all click, good spark in coils and plugs, so now I am at the fuel pump and filter, filter I can change but want to see if the pump is up to speed before I just change it for no reason.

I read a thread earlier about the MAS and wondered if maybe that can be it also but I at least want to check other things first. If I unplug the MAS and the car runs better then maybe that is it's test for the MAS or will the car not run at all if unpluged, I am not a mecahnic but getting better as time goes on.
Thanks for any help you can lend.

Thanks Tony H.

 

Tony I can look at my car at lunch and tell you but I need you clarify what "eccerate" is. Do you me accelerate or do you mean something else?

Thanks and I'll post my findings around 1:30 or so central time unless someone beats me to it.

 

Fuel pressure at idle should be 36psi +/- 3psi. So it doesn't seem like a fuel problem unless the pressure drops when engine speed/load rises.

You can measure fuel flow by feeding the return pipe at the top of the tank into a container for 30seconds with the fuel pump relay bridged. You should collect 1350cc (1.43 US quart)

Sounds like a MAF problem to me.

 

Ok, My pressure at idle is 30 to 31 max P.S. I and yes my spelling stick I meant to ecelerate to engine ( Make the idle higher). When I do make it faster I do not see a drop in pressure but it seems low top begin with according to the replies so far, my car is old. I am going to look for a good pump of a know good pump for sale and a new filter and I guess for the heck of it a MAS any takers out there for parts for me?

I do not a a hughe set of known good parts to try on my car laying around to just stick on there to try so I have to buy them as needed. There seems to e no one in my area of the country with this car? At least the car will start now it would not before. Making some progress with all of the help you all give.

Let me know about parts if any one knows where to try that will help. Or if any one has the stuff I need let me know. All 3 items if I can without leavinf my wallet open to long.

Thanks Tony H.

 

Yes spell check should be used I know!!
Known good parts not laying around!!
No one in my area with parts to try!!
Looking for Parts mentioned above with out huge expense??? Any ideas???
Thanks for all of the help!!!!

Tony H.

 

Louie Ott, my US agent has a MAF flow jig and will test out your MAF. If faulty he can supply you with one of my rebuilds.

http://www.performance928.com/cgi-bi...pass_parent=0/

 

Ok, If I need to have them test my MAS how do I reach them to test it and what might be the cost of a rebuilt MAS if needed? Thanks.

Tony H.

 

That fuel pressure at idle is normal. Try putting a jumper on the fuel pump relay with the car shut off and check it, should be around 36 psi.

 

Sorry for the newbee question in all this, but how does one jump the fuel relay?

Dave

 

to jumper the FP relay remove relay XX and jumper pins 87 and 30.

Your fuel pressure is fine.

Try to adjust the MAF (not MAS) for the idle CO level to get the car running.

 

The WSM manual has a great description on page...........wait for it...........:

 

Make up a short wire with small spade connectors on each end. Remove the fuel pump relay and connect the spade terminals to 30 and 87 in the CE panel and this will allow the fuel pump to run with the car shut off.

 

Hi, I think we have 2 people trying to get info here on this tread which is OK.

I am Tony H. and I know how to jumper the relay, but I do not know how to adjust the MAF nor do I know exactly what it is or where it is located to adjust it or how to adjust it, My manual is at the shop with the car so I can not access it here.

If you can tell me I will try to adjust it but it would help to know what to adjust and which way to do it?

Thanks Tony H.

 

I think I am confusing myself, the MAF is the body that hold the MAS correct so i would know what the MAF is. The round tube looking body under the filter correct? If so then what and how is it adjusted?

 

One more thing I removed the airpump when i did my timing belt and water pump, someone mention to me to do that and that it would make my car lighter and run better, I think Roger suggested it at 928rus, anyway who makes nor difference now, but someone else siad they thought it might effect my running condition due to having the cats still on the car, and they are still on the car but the airpump is not, any thoughts on that issue?
Thanks Tony H.