My Baby Won't Start

KilnRed;1782 wrote:

Really??? It tells me that I have a definite problem with my injector circuit. That eliminates quite a bit of the diagnostics right there.

You can tell that by listening as the car cranks over. If the injectors are not clicking, it's not getting power. There for you don't need to pull the fuel rail covers (if you have them), or pull the harness connectors. Only time I ever use one is if I know one injector is not clicking, and need to know if it's a harness issue or a failed injector.

SeanR;1784 wrote: You can tell that by listening as the car cranks over. If the injectors are not clicking, it's not getting power. There for you don't need to pull the fuel rail covers (if you have them), or pull the harness connectors. Only time I ever use one is if I know one injector is not clicking, and need to know if it's a harness issue or a failed injector.

You can tell with your ear and I can tell with mine, but Ben might not be able to with the starter engaged. Either way works. Looks like you have much better ears than I do, Sean. That's quite a skill to be able to pick out just one bad injector, just by sound. I might be able to isolate one with the help of a piece of PVC pipe or something similar.

KilnRed;1785 wrote: You can tell with your ear and I can tell with mine, but Ben might not be able to with the starter engaged. Either way works. Looks like you have much better ears than I do, Sean. That's quite a skill to be able to pick out just one bad injector, just by sound. I might be able to isolate one with the help of a piece of PVC pipe or something similar.

Use a stethoscope or a long screw driver, those things make quite a racket

Sean, Sorry I haven't been too involved and thanks for your response. TPS seems to be making a click noise. Don't here fuel pump hum. But that doesn't mean much, I don't hear too well after 20 years of helicopters. Will return on line shortly.

bstevens;1790 wrote: Sean, Sorry I haven't been too involved and thanks for your response. TPS seems to be making a click noise. Don't here fuel pump hum. But that doesn't mean much, I don't hear too well after 20 years of helicopters. Will return on line shortly.

Ben, I would be surprised if your fuel pump wasn't running at this point and that the issue not be somewhere else. That said, it is still both easy and important to confirm that it is working. You need to get a 12V test light. If you don't have one now, buy one. It should be kept in the glove box of your 928 along with some extra fuses and relays. Having those things on hand at all times may very well keep you off the side of the road.

Anyway, you need to access the central electric panel. It is located at the passenger side footwell. Pull the carpet out of the way. This will reveal the door that covers the CE panel. Prop it up with something and grab your 12V test light. Ground the test light at one of the ground points just above the CE panel. Now, apply the test light to fuse #38. They are numbered from left to right. Start the car. The test light should show power on the fuse throughout the starting and for a few moments after you release the key. Test both points of the fuse. If there is no power, remove the fuse and inspect it for corrosion and be sure that it's not blown. Replace if necessary.

If there is still no power, you need to check relay XXVI. Swap it with relay V; the starter relay. If the starter now won't engage, then you've found the problem and will now need a new starter relay. If the starter turns, then you already know the relay wasn't the problem. If this is the case, now swap relay V with relay XXV; the LH relay. No starter this time? You'll need to replace the starter relay (V) with a new one. The fuel pump should now run.

I doubt you'll find that your fuel pump isn't getting power to begin with, but we need to be sure. If there actually is something more disrupting the circuit than a fuse or relay, then the next thing we need to do is find out why.

bstevens;1761 wrote: Austin, to answer the rich or lean question. Running extremely rich. Was going through gas like there was no tomorrow. Even had some flames coming out of exhaust pipes. Looked like a funny car. But not too funny

Am I missing something here?
If it is flooding then the fuel pump, module and injectors are fine. :confused: ok the module could be holding the injector open to long.

bstevens;1761 wrote: Sean, Sorry I haven't been too involved and thanks for your response. TPS seems to be making a click noise. Don't here fuel pump hum. But that doesn't mean much, I don't hear too well after 20 years of helicopters. Will return on line shortly.

Dose not the fuel pump on the 928 run for a 5 sec prime and then quite or am I wrong.


and then after it is pressured up only run again while cranking or am I wrong again.

I have not worked on mine yet but I thought that was the way they were built, so that in a accident, when the engine quit, the pump quit, or is this only an american safety feature.

Austin has the easiest way to check relays and then you may want to confirm the flooding by pulling a spark plug, but if the exhaust is full of fuel and the ignition is lighting it, then both of those work.
Could be to much fuel,(temp sensor, MAF, Regulator) and other then those guesses maybe someone that knows the test resistance's of some of the components may help.

Ben do you have the manuals that you can download