Running Out of Fuel - Video Inside*
#1
Running Out of Fuel - Video Inside*
I got my car tuned a week ago, very solid tune from respected shop.
I did a hard 1-2 pull a couple days ago and shortly after, I noticed a few misses at partial throttle, light load (cruising in 2nd gear).
I got into low boost (5-10psi), and the car acted fine. Got deeper into boost and noticed my AFR's were not dropping, and then suddenly spiked and went full lean. I let off before it started to miss. The problem really seems inconsistent.
There have been no trouble codes set.
It does have a recently installed Deatschwerks 300LPH fuel pump.
I really would like to check fuel pressure, but I have the stock fuel rail, and am weary of going aftermarket, as it may affect my tune (which is a 350 mile drive)
Thanks for any help!
I did a hard 1-2 pull a couple days ago and shortly after, I noticed a few misses at partial throttle, light load (cruising in 2nd gear).
I got into low boost (5-10psi), and the car acted fine. Got deeper into boost and noticed my AFR's were not dropping, and then suddenly spiked and went full lean. I let off before it started to miss. The problem really seems inconsistent.
There have been no trouble codes set.
It does have a recently installed Deatschwerks 300LPH fuel pump.
I really would like to check fuel pressure, but I have the stock fuel rail, and am weary of going aftermarket, as it may affect my tune (which is a 350 mile drive)
Thanks for any help!
Last edited by blknblubkrdude; Jun 10, 2011 at 01:15 PM.
#2
Evolved Member
wow ur cold start is all over the place, not tryin to be a dick but i was watchin your wideband it was all over the place...might wanna adjust that, now you sure no vacuum leaks? hoses popped off there nipples? haha
#3
The coldstart is not the issue. The car is missing in open and closed loop. It is running out of fuel under load and little to no load.
I am sending the DW300 pump in to get tested. I wish I hadn't thrown my Walbro255 out, so I could test with a known good part.
I am sending the DW300 pump in to get tested. I wish I hadn't thrown my Walbro255 out, so I could test with a known good part.
#4
Evolved Member
sorry to hear blknblu, ive read some good info on that dw300 pump, but also hearin some stories of people havin issues with them, to start ur best bet would be make sure everything in the fuel pump assy is all properly connected and fastened down.
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#8
I'm hoping so!
That's the first thing I checked, because I actually had my boost gauge plummed into that vacuum line.
Yeah, the AFR is very abnormal. When I get into the throttle lightly, you can see the ratio go full lean and start missing .
When running right, the analog is much easier on the eyes, especially at night. Which is why I disowned the digital gauges.
Thanks!
That's the first thing I checked, because I actually had my boost gauge plummed into that vacuum line.
When running right, the analog is much easier on the eyes, especially at night. Which is why I disowned the digital gauges.
Thanks!
#9
Evolved Member
well heres what you can do man, go to autozone or another parts store rent one of there fuel pressure gauges, cuz if im not mistaken one of those kits you can t into the vacuum lines, so disconnect on the t where your boost gauge is tap in the pressure kit to it, put it underneath ur hood to where you can see it by the firewall and windshield, go do some pulls and see if your fuel pressure is dropping hard at wot.
#10
It did something very odd today. I took it to my storage unit today, and for the first 1/2 mile of driving it was random misfiring. I could hardly get over 25mph.
Out of nowhere, misfires ceased, and it ran smoothly. I was able to accelerate to the speed limit. I got to my storage, and it was idling pretty smooth, with no misses.
I pulled the fuel pump out, and everything checked out ok externally. Im sending it to Deatschwerks to be tested, just in case.
Out of nowhere, misfires ceased, and it ran smoothly. I was able to accelerate to the speed limit. I got to my storage, and it was idling pretty smooth, with no misses.
I pulled the fuel pump out, and everything checked out ok externally. Im sending it to Deatschwerks to be tested, just in case.
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