jcg928s

Hey Guys,

So, I get to drive my 84S twice a month. She usually sits in the garage all shiny and awaiting my arrival.

Until Today.

Never an issue of starting or driving.

Today I get in her and after I turn the key, I usually hear the fuel pump. Today it was silent. Spins over fine, just doesn't start up.

So, of course I remove the panel and listen. Sure enough I don't hear the fuel pump relay click. No problem, I make the jumper for the relay then, Voila! I hear the fuel pump run. Woohoo!

Still just spins over. Hmmmmm

So, I remove the intake and spray a little WD40 in the Mass Air to see if she will fire (Thinking maybe a clogged fuel filter). Still nothing.

I then proceed to see if I have spark. I remove a plug wire, insert a screw driver and hold close to a ground source, no spark. I even tried the end of the coil wire that attaches to the distributor. Held the metal end of the screw driver close the tip sticking out of the distributor for the coil and same thing. No Spark.

Any ideas what would cause the fuel pump relay not to engage and the vehicle to have no spark?

Sorry for being so long winded, but I wanted yall to know what I have tried.

Thanks Guys

depami

Not sure about an 84 but newer cars won't pick the FP relay without spark. How about the infamous "green" wire?

Kiln_Red

Do you have a Euro or ROW 928? Two different fuel systems and ignition systems for your MY.

jcg928s

Sorry about that guys, its a ROW, not Euro.

jcg928s

and I will check the green wire right now, thanks depami!

Kiln_Red

This is true of an '84 as well.

linderpat

I think you are a very lucky person - that you are not dead - the way you checked for spark was extremely dangerous. There is quite a bit of amperage in that system, and holding a screw driver to it like the way it sounds you did is a recipe for disaster. Also, I would not have sprayed wd40 - oil - on my maf wire. I would have used carb cleaner to clean off the platinum wire.

Orantes

Maybe crank reference sensor. They go bad without warning. Engine will turn over fine but will not fire. Easy change out (if you don't bust it when removing).

Lizard928

Ok let's take this a step back.

ROW = euro
You have a US car.

1984 US doesnt have a MAF. It is L-Jetronic and uses the barn door.
It also doesn't have a CPS. Instead it uses a hall sensor in the distributor.

Your problem likely rests with the engine control relay which will require a 3 way wire to jumper.

Hilton

Possibly caused by Kiln_Red's post - but this makes no sense.

"Euro" and "ROW" commonly refer to the same thing - i.e. a 928 produced for somewhere outside the North American market.

All MY84 cars outside the north american market (whether in Europe or anywhere else in the world than the USA/Canada) have exactly the same ignition system - LH2.2 (largely the same as USA 85/86 model years).

Is your car a US model, or a grey market import ("Euro" aka "Rest Of World")?

If your VIN starts with WP0ZZZ then its got LH-jetronic injection (which uses a MAF - and should definitely *not* be sprayed with WD40). If its something like WP0JB... then its a North American market car with L-Jet which uses a different kind of air metering system ("barn door").

Landseer

A ROW is a Euro.

Isn't your car an 84 USA?

How did you cross reference the relays last August, 2011?
You were using the wrong relay at that time for injection.

Fuel Injection, Fuel pump and AFM are the important relays.

Generally one of them, or an unclean ground or wire break (due to mice) are the things that take them down. Sometimes thermo/time also.

(looks like we all replied at once)

Kiln_Red

Sorry fellas. Brain wasn't firing correctly while typing that post. I meant to ask whether it was Euro/ROW or US? Guess I had both Euro and ROW on the mind while typing.

jcg928s

Hey Guys,

Ok just to clarify. It is a USA car. (I didnt know what a ROW was, so by Kiln_reds post I assumed that ROW was USA. Sorry my Mistake)

She is running fine now. I know I am probably going to get blasted for this, but this is what happened.....
As some of you know, I am a christian and I pray quite a bit. Well I was praying on whether to sell her or not. She is paid for, but I recently sold my Lexus and bought a 2008 SRT8 Grand Cherokee. This Jeep drinks gas like nothing I have ever seen. So, instead of trying to daily drive the 928, I was going to sell her and the Jeep (Being I am VERY upside down on it) and get something more economical. In fact I was taking pictures of her to put her up for sale tonight. I walked in the garage and the problems began. It was only when I prayed and said "OK God, I do love this 928, but I could use the money. If I am not supposed to sell her please just help me fix her at least". I walked back in the garage, Knelt at the passenger footwell, turned the key and Vroooom.

Now, maybe it was a coincidence, maybe my cars new name will be Christine. LOL. All I know is, I thanked God and will probably NEVER sell her. I will just have to try and keep my foot out of the Jeep and Maybe drive the 928 more.

I am not trying to push my beliefs on anyone, or trying to convert anyone. I am just relaying what happened. If that offends anyone I apologize.


Anyway, thanks guys for all of the input. Again I apologize for the mixup on the ROW thing, I just didn't know.

Linderpat, I thank you for the advice. I have been bitten by her once before from a bad plug wire that had a split in it. And let me say, it definitely was not fun. (I have since replaced the set). How should I check for spark next time? I have a digital meter, would that work?

Landseer, I remembered when I had that issue and I was actually looking for that post. I even looked up the receipt to make sure what relay I was looking for.

You guys ROCK. As always, my 928 Brethren are always there in a time of need. If she hadn't decided to act right, I would have a lot of places to start because of you guys. Thanks again!

Lizard928

Get another fuel inj relay to have in the car at all times.

jbrob007

Joey, Great that its running, but our car STILL has a problem... Probably gonna be a PITA to figure out but HOPEFULLY its a only a bad/sticking relay or intermitten ground. Your gonna need to figure it out before she leaves you stranded in a much less desirable location.