frostyflax17

1982 928 w/ competition package 5spd black on black w/ sport seats
79k on body, 12k on rebuilt 4.5L

hasn't been driven in a couple years, but it hasn't been sitting either, it was running last year, but was taken apart for some maintenance by the previous owner.

I traded one of my cars for it without it running, so here i am now... trying to get it running.

here she is, my other cars in the background. the opel is my dads.


anything look amiss back here for getting it to run? there's no carbon canister hooked up, would that cause it not to run?

what does this plug go to?

compression numbers... cyl #8 seems to be lacking, might have some build up on the valves, i'll retest after she is running

engine bay shot, anything look amiss for it not to run?

sitting purty in the garage.

video of it starting... then stopping


i tested the compression and spark all around, all was working good. she cranks, and will start... for about 2 seconds.

I checked the wires and made sure the timing was on and all the cables were hooked up right.

Any other ideas on how to get it running? or does someone want to come give me a hand in Central NY? I'll give some money and beer

Rob Edwards

Between pics 2 and 3 I see 3 disconnected 2-pin injector-type plugs. I don't know anything about 16V cars but I'd have to guess that they should be attached to things...

Experienced opinions will be forthcoming shortly.

frostyflax17

oh woops, i connected those when i tried to start it lol.

actually though, while i was doing the compression check, i disconnected those wires and it still wanted to fire up... residual fuel?

Kalspeed

Have you checked fuel pressure? Injectors ok? Does your fuel pump run constant in ign on, eng off?

Plugs, wires, distributor cap?

Kevin in Atlanta

Nice Audi Quattro Coupes.

Ethre

Carbon canister system is connected to a couple of vacuum hose, so these may be wide open. If you look up at the underside of the hood when open you should see a vacuum diagram which will help you trace them down.
You might also have some sort of fuel leak (or evaporation potential) depending on how it was disconnected.

Ducman82

have attached the AFM on the back under the air box? i left that un hooked once, ran but not really

soontobered84

Sounds like your injectors aren't really working. Probably starting on the cold start valve and then running out of fuel after a couple of seconds. Check your fuel injection relay.

Ethre

Good point - if he removed the airbox he probably pulled the assembly with the AFM on it.

Another note to Frosty: Be careful with those AMP style plugs. They're probably pretty brittle by this point.

Podguy

Ok one other thing to check that messed me up a couple of times. Generally when a car has set the battery is removed and charged. There are two nuts on the battery terminal. One tightens the battery terminal to the positive post. The secondary connection connects two thick red wires to the positive terminal. If the nut holding these wires to the terminal are loose the car will act normal and crank over, but these wires feed the computer. A loose connection can be intermittent with the car starting sometimes and not others. Clean and check this terminal.

Good luck with the car. Oh put some oil in the low cylinder and it will come up to spec.

dogleg

is you car us spec with L jetronic injection or euro spec with k jetronic?

tailpipe

do the two relay jumper wire trick I had the same symptoms on my 83 both relays were toast

WallyP

"Relay, relay, relay..."
J. Bailey

frostyflax17

plugs were good, all getting spark, dist cap looked good under there, wires looked ok too
thanks, definitely one of my favorites
unfortunately when i got the car, i didn't get to see the orientation of the carbon canister and the lines going to it. So there may be some lines i can't see that the previous owner disconnected. It's hard going into someone else projects. i need another 928 to compare it to. I'll look for the diagram. I also have been referring to the ebay manual cd i bought for 30$, scans of the original books. Helps, but alas i'm still not the best mechanic when it comes to these cars.
i'm not sure what that is (i'll do a search in a minute), but i didn't see any disconnected plugs on the under side of the intake. Only plug i can really think of is the one going into the throttle body.
how do i check the injectors individually? On my audi i can pull the fuel rail and put the injectors in a bottle, with this i can't move the fuel rail with it still connected. Tricks?
Checked the grounding points and connections already (omgz i read the common problems sticky!!!) lol
So i don't think that's the issue
honestly i don't know, but i'm thinking the us spec, because if it was the euro spec it'd have the 4.7L v8 right? and not the 4.5? How can i check this?
do tell... i don't know how to check if relays are working properly...
I'll try a "2 relay jumper wire trick" search and see what it comes up with

dogleg

no, early us cars can be 4.5 or 4.7 im only familiar with the euro spec injection these type is basically mechanical little or no electrics it has a big 8 pipe fuel distrubitor at the back of the engine under the air box.