dougefresh_
Member
- :
- 2006 MS6 wwp
In a nutshell, I'm not holding idle pressure well (200-300 PSI) and haven't since my 1st hpfp failed about a month ago, despite 2 other pumps.
Here's the timeline on the pumps:
1. Got a PTP pump (pre-assembled), and my old mechanic installed it. I was careful about the break in period, and it worked great.
*Idle Pressure 400-500 PSI
*WOT Pressure 1,700-1,900 PSI
2. No problems until two months later when I was tuning my ebcs. I was taking a WOT log, and I caught both the ebcs dying, and the fuel pump failing mid-shift.
*Idle Pressure now only ~175-300
*Not holding WOT pressure
3. Didn't drive it much at all, and sent in pump #1 for a replacement. When I went to install pump #2, I was wiping down inside where the pump attaches, and I pulled the cam follower out a bit. I had no clue it was in there, and I just looked at it very briefly, and put it back in. I lubed the inside, and installed pump #2.
4. I performed the (new) break in procedures. I went to drive it, and I got fuel cut almost immediately at 4K... PSI dropped to 50. I pulled over, let it idle, slowly held revs, and repeated. I started driving and it cut again. Pulled over, repeated the idle/revving and then continued to drive with NO problems. However, my idle pressure was all low. 200-300 PSI.
*Idle Pressure ~175-300 PSI
*WOT pressure seemed fine, but when I called they said the low pressure isn't right, and I sent that pump in for my $ back and a stock pump
5. I installed the stock pump last night (which does not require a break in period), but I let it idle for 5 min-10 mins anyways (no smoke at least, lol). After the car warmed up, idle pressure is low again ~200-300 PSI. It holds presssure great cruising and up to ~1,650 PSI under WOT (this is a stock pump). It only holds ~300 PSI under engine breaking, which was the same with the other bad pumps.
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I talked to my mechanic about this, and he said the first fuel pump that seized (quit mid-shift at WOT) could have caused the cam lobe to whack the cam follower, and cause damage to both. He said to take off the pump, and look in there and check everything out. I did that after work, and took a bunch of pics, and a vid.
The cam follower definitely has a tiny nick in it, but I'm not 100% on the cam lobe. It doesn't look good though. Here's a bunch of pics of the follower, lobe, and a vid of the lobe.
Follower still in
Inside follower:
Nick side of follower facing lobe
Cam Lobe Pics:
And short vid of lobe (in HD if that helps):
YouTube - M4H00826.MP4
What do you guys think? Is the cam ruined or is it just the cam follower or both? Can I drive the car, or is it going to cause more damage? This fuel pump rattles also. It did when I first put it in yesterday, and again today after I put it back together. The key is my idle fuel pressure has been low ever since that first pump died. It has never recovered
Here's the timeline on the pumps:
1. Got a PTP pump (pre-assembled), and my old mechanic installed it. I was careful about the break in period, and it worked great.
*Idle Pressure 400-500 PSI
*WOT Pressure 1,700-1,900 PSI
2. No problems until two months later when I was tuning my ebcs. I was taking a WOT log, and I caught both the ebcs dying, and the fuel pump failing mid-shift.
*Idle Pressure now only ~175-300
*Not holding WOT pressure
3. Didn't drive it much at all, and sent in pump #1 for a replacement. When I went to install pump #2, I was wiping down inside where the pump attaches, and I pulled the cam follower out a bit. I had no clue it was in there, and I just looked at it very briefly, and put it back in. I lubed the inside, and installed pump #2.
4. I performed the (new) break in procedures. I went to drive it, and I got fuel cut almost immediately at 4K... PSI dropped to 50. I pulled over, let it idle, slowly held revs, and repeated. I started driving and it cut again. Pulled over, repeated the idle/revving and then continued to drive with NO problems. However, my idle pressure was all low. 200-300 PSI.
*Idle Pressure ~175-300 PSI
*WOT pressure seemed fine, but when I called they said the low pressure isn't right, and I sent that pump in for my $ back and a stock pump
5. I installed the stock pump last night (which does not require a break in period), but I let it idle for 5 min-10 mins anyways (no smoke at least, lol). After the car warmed up, idle pressure is low again ~200-300 PSI. It holds presssure great cruising and up to ~1,650 PSI under WOT (this is a stock pump). It only holds ~300 PSI under engine breaking, which was the same with the other bad pumps.
------------------------------------------------------------------------------
I talked to my mechanic about this, and he said the first fuel pump that seized (quit mid-shift at WOT) could have caused the cam lobe to whack the cam follower, and cause damage to both. He said to take off the pump, and look in there and check everything out. I did that after work, and took a bunch of pics, and a vid.
The cam follower definitely has a tiny nick in it, but I'm not 100% on the cam lobe. It doesn't look good though. Here's a bunch of pics of the follower, lobe, and a vid of the lobe.
Follower still in
Inside follower:
Nick side of follower facing lobe
Cam Lobe Pics:
And short vid of lobe (in HD if that helps):
YouTube - M4H00826.MP4
What do you guys think? Is the cam ruined or is it just the cam follower or both? Can I drive the car, or is it going to cause more damage? This fuel pump rattles also. It did when I first put it in yesterday, and again today after I put it back together. The key is my idle fuel pressure has been low ever since that first pump died. It has never recovered
