Ok, so after the fan clutch siezed and resulted in the fan blade coming apart and sending the blades everywhere, I finally got the car back this morning.
Several hoses had to be replaced as they were sliced open and the coolant drained out. The car never overheated, I noticed the needle flying up and pulled over immediately. The airbox on the drivers side had to be replaced as it was sliced in half. I had a Dinan intake and mass airflow setup that I had not installed yet, so I used that as on opportunity to put them in (AA setup on there now, routed everything to the dinan, will report on how that works later)
So I pick it up and decide to take it for a drive. The car acted fine for the first thirty minutes or so. I drove long enough to warm up the engine and reved it up to 6800 a few times in nuetral once it was warmed.
Suddenly the power dropped off. I initially thought it was in safe mode, but the tempurature was fine and no check engine light came on.
It became apparent to me that it would not rev past 2800 RPMS no matter what unless I downshifted from a higher gear.
I can't figure it out, the mechanic thinks its a software issue, but we are perplexed that nothing popped up on the display.
Any chance that coolant or oil might have fouled the MAFs? At least on the side that was sliced open?
When you downshift will the rpms stay up, or will it drop back to 2800 eventually. Is it limited power or a true RPM limit?
wierd..
No lights, the shop was actually not open when I picked it up. The owner was doing me a favor and meeting me early on saturday, I told him to let it sit until normal hours since I didn't have time to stay there while they got the codes off it. We are both most interested to see what we come up with though.
I didn't think about the MAF's, but I put the Dinan Mass Airflow meter's in, and knowing this shop, they usually clean the MAF's anytime they get in that area.
It truly is acting like a rev limit. If I downshift from a higher gear, it will do it with no problems, but I can't give it any gas. The rev's will just drop to about 2800 and stay there and you can hear it pulsing, similiar to when you hit the normal rev limiter and the engine kind of bounces off of it, though nowhere near as violently since its so much further down in the power range. When I come into it, the rev's start to drop around 2500 and won't go over 2800 no matter how much gas I give it.
The engine isn't heating up, and turns fine otherwise. And it did drive fine for 30 minutes before it did this. I wonder if there was coolant that was still in a housing or something somewhere that didn't move again until I started driving it?
Sounds like it might be a loose hose in the intake line after the MAF. Check the connections and make sure that the "sliced" portions of intake tract have been fixed.
Exactly the same situation i get if im on full power in any gear and hit between 4 and 5k rpm. Loose power and then can'r rev past 3k rpm approx. When revving at idle it pulses at 3k.
Switching off then on again gets me back to full power. I've had others say it could be the MAF's or the CPS. I get Cylinder #1 Misfire code.
Exactly the same situation i get if im on full power in any gear and hit between 4 and 5k rpm. Loose power and then can'r rev past 3k rpm approx. When revving at idle it pulses at 3k.
Switching off then on again gets me back to full power. I've had others say it could be the MAF's or the CPS. I get Cylinder #1 Misfire code.
Same here. Has happend a few times, every time when going a little "quick" 200+ km/h. No problems when just driving agressive, but high rmps for a short while. Start/stop of engine and it's back to normal. Have not found out why it happens.
So I got it looked at today, and the engine had gone to limp mode due to running excessively lean. There were faults all over the place over too much airflow. I had not heard of this, but in the process I replaced the mass airflow meter and added the Dinan intake to the AA setup that was already on there. So perhaps I am flowing more air.
I had the AA software in there now, which I have not been pleased with at all. The dealership that did the Vanos repair (different place than where I service it) is a Dinan center and offered a nice discount on the Dinan package that Dinan reccomended to solve the problem (I think it was stage 3 for my mods, but can't recal offhand)
I still haven't installed my headers yet from the group buy, sounds like I need to get going on that!
Last edited by Shakazulu12; 9th January 2007 at 16:54.
So conclusion for those of us without dinan mods is to replace the MAF's?
Sorry, I need to edit my post, I installed the Dinan intake and mass airflow meters, kept the same MAF's, just cleaned them.
Both shops and Dinan agreed that the car was seeing much more airflow than it had been seeing before, which was causing it to run way lean. I have my doubts as I didn't think any intake systems went that far, but it was what both shops came up with plus Dinan, so I'm just gong to sit back and see if the software really fixes it.
I will let you know by tonight as the software is set to be installed later today.
Sounds like it might be a loose hose in the intake line after the MAF. Check the connections and make sure that the "sliced" portions of intake tract have been fixed.
Bullseye!
The MAFs usually kick in at 3000 RPM. And it seems from your symptoms that the MAF cables have been damaged. Ot atleast the connector!
__________________ 2006 Sepang Bronze/Naturelle Brown E60 M5
Eisenmann Sport Mufflers
Miesterchaft Sections 1 & 2
Evosport Headers
Evosport Pulley
RPi RAM Scoops + Block Off Plates + BMC Filters
AL-Tuning Software
Eibach ProKit Springs
20" Breyton Race CS with Yokos
White Angel Eyes, 6000K HID's & LED Plate Lamps
ACS Roof Spoiler
Linear Mode
