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Everything posted by Kenneth Behrman
Hey I figured I would give an update since it always bothers me to see a long thread with no solution. I completed the coils and new plugs, checked again for vaccuum leaks. Then went out and took some logs. The MAF was reading 5.7 g/s at idle, at 7k it maxed out about 180 g/s. I ran logs a couple times and found the same result over and over again. Fuel trims showing rich at idle, lean at high rpms. I found the specs on the MAF readings and at idle it should be near 4 g/s and WOT at 7k Should be near 215 g/s. Knowing that these are the nominal values, if the car i
Unfortunately, I agree. I may have to wait until I can bring it back to the dealership and we have additional time on a Saturday or something to truly dig into the issues. I am still concerned there is some sort of tune or modification to the MAF calibration that is interpreting the signal differently then it should be. When I purchased the roller, the previous owner supplied a MAF that was not a factory part and called it a "performance MAF". Again there were alot of running issues I worked through in the beginning, most of which have been solved, but that comment h
I am positive the airbox is from a 3.4L and I confirmed the MAF part number, same as previously written in posts above. My idle is steady at 700rpms. I will run the other MAF I have tomorrow and confirm that I pull the same numbers. Side note: I disconnected the purge valve and plugged the intake port, but not change in MAF numbers or performance so that theory can be ignored.
Hey Guys, Just giving a quick update. My Porsche tech friend took the car for a week and really found nothing out of the ordinary except the rich condition at idle and lean condition at WOT. He didn't have much time to dig deeply but we had quite a few conversations about it. My timing was normal and I was not recording any misfires. I am however, truly running rich at idle and lean at WOT based on trims and O2 feedback. These conditions explain the issues I am experiencing. Here is what I have found based on some previous post recommendations to check.
Will do. I have checked voltage and the MAF signal. All appears normal. If I recall my G/s on the Maf at idle was within spec as well. I did install a factory air filter box. This made any stalling issues I had go away completely. With the K&N installed, I did not have any additional codes, but after going WOT, or sustained highway driving (cruising around 3-4K) for 15+ mins, if I put the clutch in the car would stall. I could keep it alive with a couple blips of the throttle, but sometimes even this would be difficult. Like an idle was non existe
This is the MAF I have. It is a Bosch. Porsche Part number 996.606.123.00 Bosch Part Number 0280217007. Some I have seen have additional numbers beyond it like M14 or MS19. Are these part revisions?
Thanks Ahsai. You have provided some good information! I will run a log and check the fuel flow and check back in. There are no internal mods. Unfortunately I do not have a Durametric, so I will have to wait till my Porsche Tech friend could pull numbers such as these. Fuel pressure was checked and double checked at idle and the car off, both were dead on. I am not quite sure what I should see when I apply throttle. Should I see any fluctuation? How much? I can easily test pressure again. Side thought: I have read t
I did check fuel flow with a bucket when I did the fuel filter. I don't remember the exact numbers but I could check again when I have it up in the air to do the coils and oil change in a week. Does anyone have the numbers handy I should be looking for? GPH? I am sure it is in the service manual somewhere as well. I did not send the I injectors out, and I still regret that.. I was considering a leaking fuel injector as a cause of the stuck rich condition, but with how many times I've checked the plugs I think I would have noticed something by now? Maybe not. I ran inj
Hi Joe, I am familiar with this post. I started all the trouble shooting with the MAF and I have been through 3 at this point to no avail. The one that came with the car, 1 new one, and 1 removed from a problem free 986. The new one and one removed from another vehicle yielded the same result. I think the original was dirty. I am currently running the new one with 3k on it.
Afternoon guys/gals, First off, these forums have been great to learn and utilize for DIYs. So, big thank you to all that contribute. I have had my 911 for 3 years, its is a 1999 Porsche 911 Carrera C2. I bought it as a roller (Old engine spun rod bearing) and sourced parts for almost a year before I finished it in 2017. Long story short, I have one remaining issues I have spent 2 years chasing. I have a friend who is a Porsche tech that is going to take a look at it when I can get it to him in a few months. Before that, I thought I would give the community an opp