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Like Lewis said it can be any number of factors, there are 5 to start with, 2 in-tank fuel pumps, fuel regulator and filter (in tank as well) or the high pressure fuel pump. First thing is the 2 pumps in the tank. Have them tested to make sure fuel is getting to the HP pump at the pressure and flow required.
Finally the saga is over. Replaced the HP pump and all is good. Except the starter was going, service said the amp draw was high. I knew it was harder and harder to start and figured that it needed to be replaced soon anyway. So.... pull the intake and fuel rail and replaced the starter and now she starts right up. After almost a year of fighting with it it is finally over, updated tags and running good. Next up trans service and new plugs.
Here's the latest. Dealer service finally has agreed with me that it's the HP pump that is suspect. They are going to replace it under warranty. Next appointment is this coming Wednesday. So today, I'm out and about - taking it easy on it for fear of total failure and sure enough, it died from fuel starvation. Was able to get it to restart twice, enough to get it home but it has definitely given up. Acts just like it did almost a year ago when I replaced the last HP pump. At least I'll get some confirmation when it shows up on the back of a wrecker, huh? Hoping the end of the saga is nigh!
The service guy said when I got it done to come back and they would reset everything so I'm going to take him up on it, may work, may not. I'm with you Lewis, I think the new pump is bad. Didn't have this problem before the pump was changed and we've eliminated just about everything else. $250 an hour, and I thought $190 per was bad.
Well. got them replaced, went out for a test drive with Durametric running live on the HP Fuel Adaptation 1 and it started out at 0.79, good. After a couple of miles it started dropping eventually after about 7 miles it is back to the dreaded 0.69. HP fuel pressure still fluctuating back and forth over the set point. Another grand, same problem.
I hope your feeling is right. I already replaced the regulator and the filter so just the pumps and the L fitting are needed, $430 before shipping. I've already been in there so I'm familiar and the Pelican write up is pretty good but if I run into problems I'll give a shout.
The latest. This dealer has had it since last Wednesday, called today to say that the tech thinks it is the low pressure pumps in the tank. Well those haven't been replaced yet but tested fine previously. So off to replace another set of parts. Good news is the dealer has offered to match the prices I'm getting at the other dealer in NC. I guess I'm busy for a bit. He quoted $2900 to do the pumps, I declined. Indy quoted $1775, a lot better but still.... I can do it.
Went to another dealership to try and get the pump replaced under warranty but that was a no go. They wouldn't take my word for it (somewhat understandable) and told me they would have to test it to see if it had in fact failed. Well it was sitting on the counter in front of him so that posed a problem. The parts guy convinced me to make a service appointment so I went and talked with an advisor who feels confident they can figure it out although after a few minutes poking on his computer he asked if anyone had considered a camshaft slippage causing the error. Well no and I would think that if the camshaft had a problem I would be getting more than just a 1025 code being thrown. But I have an appointment on Wednesday for them to start. Needless to say I had to put the pump back on the car. Much more difficult with the intake manifold in place. I'll let you know what happens. If this one at least really looks at it it'll be an upgrade. Dealer is looking to get their classic Porsche credentials so maybe they'll be more focussed. Plus I have a friend who happens to know the service manager well and has given him a heads up, wish I had known that a few months ago.
Congrats, glad it fixed it. I'm taking out the old (new) pump and exchanging for a new one tomorrow. Hopefully that will fix it. Good luck on the trans, I just can't quite get comfortable with the wheels spinning on jackstands while I'm under it, brake jobs on this car are as easy as I have encountered, especially if you don't have to replace the rotors.
So after an extended conversation with the indy and data mining in his system, call to a dealership head mechanic who, in turn had a conversation with another mechanic we have concluded that the next course of action is to replace the replaced HP pump. Seems to be a regulator type problem and the reg is integral to the pump. Luckily the pump I have has a 1 year warranty and it's only been 9 months or so. Hopefully in a week or so I should have everything to get the next step done. Maybe the last step?
Yep, we did all of that 3 times. Every time the range 1 and 2 would eventually work its way back down to 0.69 and remain static. Before it would stick it would move around like you would expect within the specified range but within 40 miles or so it would drop and remain there.
Hmmm, I'll check with the indy (good relationship now) and see what he says. I know that to do the fuel adaptation it requires the immobiliser code. That's not something to mess with, even he was very, very careful when doing it and the value had to come from Porsche NA. I have mine now but wouldn't dream of using it, a $4000 DME isn't in my plans to replace. The pump isn't that hard to install, just tight space for one of the bolts. I had the intake off of mine to do the thermostat and water pump so it was really not bad at all. Just make sure you get all the broken plastic pieces out of there.
Unless it's the HP pump I don't think it is a fuel problem anymore, has to be some sensor somewhere that is causing the adaptation to go really low or is throwing a signal that the adaptation needs to be low.
Pressure and Flow tests on LP system were perfect. Still getting 1025 from Durametric, while it doesn't tell what it is, the guys from Durametric say it is the High Pressure Fuel Adaptation 1 and that is what the actual values are telling me. Value is 0.69 when it should be 0.72 or higher.
Well that wasn't it. Changed the fuel filter and the HP fuel actuals are still bouncing all over the place.