LP928

I'm done in ft lauderdale for a few days at my dads friends shop and i fixed a bunch of problems with my car, AC, half shafts. I go to leave and now my car wont run. It cranks, starts to run and then either barely idles or dies. if you give it gas there is a lot of sputtering but it wont rev at all. Any ideas? i dont have much time im supposed to be levaing today.

86'928S MeteorGrey

check fuel pump and relay FIRST...

LP928

I've checked both of those, the pumps running so i dont belive its that

76FJ55

Check fuel pressure? just because the pump sounds like its running doesn't guarentee pressure.

LP928

The guy who was helping me out didnt know where to check fuel pressure on my car. But somehow its not getting enough fuel. Where do you check.

Richter12x2

Are you sure it's fuel? The PO of my car spent $100's tracking down issues that I later resolved to be a bad Ignition relay.

Edit: If you want to check the 53 relays, get a multimeter and set to continuity (beeps when you touch probes together). Alligator clip them to 87 and 35 on the bottom of the relay. Get a nine volt battery (or a battery jump start box, or a 12V DC Adaptor) and touch positive and negative to 85 and 86 on the bottom. You should hear a click and get a tone on the meter while you apply power. If you don't, pull a relay for something you KNOW works, like the horn, and make sure you're doing it correctly. If you are doing it correctly and you have a bad relay, swap it with something less important and pick up some Audi 53s from Roger at 928s'R'Us.

WICruiser

Test fuel pressure in the at the front end of the fuel rail on the passenger side (at least on the lter cars, not sure about the '79).

WICruiser

Test fuel pressure in the at the front end of the fuel rail on the passenger side (at least on the later cars, not sure about the '79).

WICruiser

Test fuel pressure in the at the front end of the fuel rail on the passenger side (at least on the later cars, not sure about the '79).

LP928

I don't believe the 79s CIS had fuel rails. Also sorry i didn't mention but i did put a new fuel pump relay in i had. It didnt make a difference though.

LP928

Oh sorry, i didn't see ignition relay not fuel relay. I'll have to check when i go back to my car week after next, its stuck down there now for the week. The car would start, just idle very badly and not rev at all, could that still be the ignition relay, I'm not sure what that does ?

Lizard928

Sounds like a fueling issue.

There are many sources for that on CIS cars. But if your car has an intank pump it could be running on that, while the external one could be pooched.
Not sure if the 79s had the secondary pump for some climates though.

tailpipe

check for vaccum leaks check for loose wires might even just be poor gas and its vapour locking

Dennis Wilson

May want to check the .4 and .6 ohm resistors. If one has a bad/corroded connection it would start but put out less than 3 volts in the run position and cause similar problems.

Dennis

dr bob

Go back and see what was disturbed in the engine bay during the AC work. Did the car run OK at any time after that work? Generally, I try yo look at damage thet --I-- might have done when a new condition arises immediately following work I did.

Testing fuel pressure in a CIS car generally requires a set of test CIS gauges, since you are testing for several things at once. You'll be looking at control pressures as well as supply pressures. CIS is an amazing system, but has no tolerance for dirt or hamfisted adjusting. Check all the pressures before you tweak anything.