I installed my boost gauge last July/August, and everything was fine initially. Then, I gradually started losing mileage as well as power. Granted I've been tuned for a few thousand miles (about 8100 now), but I don't drive it hard too often. I started realizing something was wrong when I didn't get much of a whoosh with my intake anymore. It was almost non-existent actually. So I figured the factory bypass valve diaphragm had torn. I also noticed that on the boost gauge, when the car would go into the vacuum side, it would snap down. In addition, in normal driving, the car would lose boost around 2500+ rpm. Actually, it would drop from 10-12 to 0-5 very quickly and would need to just use engine RPMs to go. Additionally, I noticed a slight MPG loss over the time period, and while I the weather did get colder, I still couldn't reach what I had. Lastly, I found the instant mileage on the car to still probably be accurate, but the instant mileage displaying on my Scangauge was WAY off, and bad. Could not get the car to hold a speed and hold 40+ mpg if the Scangauge had any say.
I took the car to the dealer for a number of things, but I figured the could replace the factory bpv to hopefully fix this issue. Dealer looked at it and found nothing wrong with the engine/induction system, or so they claimed. A car just doesn't lose mileage without something being wrong, I just couldn't figure out what.
Purchased a Forge atmospheric blow off valve to see if that would cure it, and I kinda wanted one anyway. That didn't make a difference, but I did get a little sound back. Still not as loud as I remember though.
Then I started thinking it might be the waste gate assembly dumping boost prematurely and sticking. Removed the heat shield and checked the external parts of the wastegate for tightness. A tiny bit of play, but not bad for a moving part.
When I installed my boost gauge, I used clear vinyl tubing. I used it on the run from the gauge, as well as I replaced the hose I tapped into so it would fit my T. Everything was fine initially, but with the heat in the engine compartment as well as the hot air in the hose, caused the tubing to collapse and flatten. The hose for the gauge wasn't too bad, but the hose sections for the car were. I know it wasn't good, but I didn't think it was causing a problem and I've had trouble finding a non-vinyl tubing in that small size.
I found a small piece of leftover hard air line in the garage which I used when putting air ride under the Excursion. It fit on the nipples, so I replaced the car sections tonight with this hard tubing. Put small hose clamps on there too.
After going for a drive tonight, it's fixed! Nice smooth boost curve and the gauge reads well too. Blow off is a tad louder too, and it was raining. My instant mileage readouts seem more accurate on the SG and more consistent with the DIC. Even though the real test will be after I can look at a couple tank averages.
The new repair:
ImageUploadedByAG Free1387693257.994114.jpg
I have a small heat shield on it by the one big hose, as well as it's tied up/away from the hot alternator.
Sent from AutoGuide.com Free App
I took the car to the dealer for a number of things, but I figured the could replace the factory bpv to hopefully fix this issue. Dealer looked at it and found nothing wrong with the engine/induction system, or so they claimed. A car just doesn't lose mileage without something being wrong, I just couldn't figure out what.
Purchased a Forge atmospheric blow off valve to see if that would cure it, and I kinda wanted one anyway. That didn't make a difference, but I did get a little sound back. Still not as loud as I remember though.
Then I started thinking it might be the waste gate assembly dumping boost prematurely and sticking. Removed the heat shield and checked the external parts of the wastegate for tightness. A tiny bit of play, but not bad for a moving part.
When I installed my boost gauge, I used clear vinyl tubing. I used it on the run from the gauge, as well as I replaced the hose I tapped into so it would fit my T. Everything was fine initially, but with the heat in the engine compartment as well as the hot air in the hose, caused the tubing to collapse and flatten. The hose for the gauge wasn't too bad, but the hose sections for the car were. I know it wasn't good, but I didn't think it was causing a problem and I've had trouble finding a non-vinyl tubing in that small size.
I found a small piece of leftover hard air line in the garage which I used when putting air ride under the Excursion. It fit on the nipples, so I replaced the car sections tonight with this hard tubing. Put small hose clamps on there too.
After going for a drive tonight, it's fixed! Nice smooth boost curve and the gauge reads well too. Blow off is a tad louder too, and it was raining. My instant mileage readouts seem more accurate on the SG and more consistent with the DIC. Even though the real test will be after I can look at a couple tank averages.
The new repair:
ImageUploadedByAG Free1387693257.994114.jpg
I have a small heat shield on it by the one big hose, as well as it's tied up/away from the hot alternator.
Sent from AutoGuide.com Free App