Nate Miller

ok everyone need some help i have a 928 which has been sitting for well over 10 years and so far i have cleaned the fuel system, cleaned the tank, replaced the filter and pump. so i got fuel check! then i checked for spark, cleaned sparks plugs and i have definite spark, check! so i didnt even change the oil before i got her turning over, and she started running and being impaitent i drove it down the road and back and she would not start after i parked her. so i changed the oil and now im stuck she wont start and im getting fuel in the intake/ throttle body? what am i missing? open to any advice??

Imo000

Checked the intake for field mouse nest?

James Bailey

So now it cranks on the starter motor. Turns over but does not fire at all ?? Have you checked for spark ?

Nate Miller

OK yes i had a field mice problem which all was left was a nest and a snake with a belly full of baby snakes( dont ask how i found out) snake broke the mass air flow sensor( replaced it). cranks over on the starter motor like i had it started and it drove down the road now it does not start at all and fuel is coming into the intake where the mass air flow sensor seets into the throttle body.

mark kibort

there is no source of fuel for the intake or TB, other than the injectors that spray in the cylinder head ports. so , its 80 us model.
there is a cold start fuel source, but that goes to the cylinder heads directly, no where near the intake ports for a source of fuel.

just check for fuel and spark. see if the ECU came loose. see if there is a wire on the temp II sensor that is broken or disconnected. green wire? if there is no spark.

Nate Miller

ok my coolant temperature sensor wires were chewed through. i fixed that but what temperature II sensor are you talking about? it seems im getting spark but i was wondering if it could be bad seels/open intake valve that the pistons compression is pushing it up through the intake valves?

Imo000

No.

Nate Miller

seriously its just dumping into the tb and the intake system, anything i can do to trouble-shoot this?

mkriete

Temp II sensor is on top front of the water bridge (between the coolant intake and exit). If it is bad I will cause all kinds of running issues. WSM provides specs for it (resistance at different temps).

Shark_gts

Be careful - check your oil level /contents of crankcase.

We revived a 1983 car and besides doing the entire fuel system - tank, lines, pump, including all pressure regulation : the injectors leaked. Leaked so much it filled the crankcase, to the point the started locked - didn't take very long either!

Had to pull all the injectors, I used LPS#2 penetrant, cleaned most of the them but some others were too far gone.

Have a fire ext handy at all times.

Nate Miller

ok im gonna look at the temp 2 sensor and i have pulled the injectors off they are not leaking. i pulled the fuel rail and injectors off and pressurized them and pushed in the injectors till they sprayed evenly. the oil i had in before i changed it didnt give off a fuel odor. so i figure im in the clear. so tomorrow temp 2 sensor here i come! if anybody has any other advice id be helpful to figure out why fuel is pouring into my intake tubes/ throttle body?

Shark_gts

Check vacuum lines off the fuel pressure regulator(s) not sure on the 1980 - I think we had 2 on the '83 (or 84) car.

Nate Miller

OK what would i be checking on the vacuum lines cause i do know what your talking about i believe there is two. so i just need to know what im checking

Shark_gts

You'll be looking for fuel in the vac lines. There is a diaphragm inside the PR's fuel on one side, vac connected to the TB on the other.

Just dusted off the shop manual, page 24-22 shows 3 x PR's: one front , two back off each rail.

We replaced all of them, looking for trouble down the road if you don't in any case. Source good used if you can.

Temp sensor is important but not a deal breaker if reading is reasonable. I had a POT connected to one once (944S), it took settings way out of range to kill the engine.

Rebooting from a barn find is a tough, but rewarding project. Dug up the video - it was an '83 car, showed up on a trailer:

Hilton

What is your VIN number?

That will help determine exeactly which variant of the 928 you have.

People talking abot stuff like "Temp II" are talking about a sensor which is only found on LH-equipped cars (84 Euro, 85-86 16V and 32V, and 87-95).

Your post title says 1980 4.5l. Which means you have either got L-jet EFI, or K-jet mechanical fuel injection. What you have makes a big difference in terms of where to start looking.

If you have K-jet, its probably the air metering plate not coming back up fully due to corrosion (or something blocking it).. but again, need to know your VIN to work out whether you have L-jet or K-jet.

Photos would be good too