Overboosting, need some assistance.

[Callaway]

Hey Guys,

Last night I removed the EPBV valve and went for a little run to hear the exhaust without the muffler (which makes this car sound as it should, btw, can't wait to put a full exhaust on). It seemed fine out of first and second gear, however once I got to third I noticed the needle on the boost gauge was pegged, same for 4th and 5th gear. The car seemed to quit accelerating once this happened and the revs just stayed high without much change in speed, when normally she accelerates quite quickly in 5th (engine retarding timing perhaps?).

Now a little background, the car has been boosting to over 1 bar for about a month or so (that I have noticed, it may have been this way when I bought it about 4-5 months ago), however I only drive it once or twice a week (and have not been going WOT in the higher gears pretty much at all due to this) and have been planning on fixing this. This is the first time I believe the gauge has actually been pegged in 3rd and 4th however. Normally it seems to just almost peg out in 5th and just over a bar in 3rd and 4th. I did plug the hose that ran to the EPBV valve with a golf tee for the time being, so I am sure that this is not the problem. Where should I begin looking for the source of this? What is the best way to check the wastegate and other boost hoses? Sorry for the long reads guys, hoping to get this sorted here soon! Thanks!

P.S. I got up to around 35 mph-40 mph and went WOT in 5th to test the clutch, the car just bogged a little and accelerated very slowly, so I am assuming the clutch is fine. Someone correct me if this is the wrong procedure for testing clutch slippage.

Best Regards,

-Erik E.

1994 Esprit S4

Edited January 19, 2006 by Callaway

[jase7678]

Hey Guys,

Last night I removed the EPBV valve and went for a little run to hear the exhaust without the muffler (which makes this car sound as it should, btw, can't wait to put a full exhaust on). It seemed fine out of first and second gear, however once I got to third I noticed the needle on the boost gauge was pegged, same for 4th and 5th gear. The car seemed to quit accelerating once this happened and the revs just stayed high without much change in speed, when normally she accelerates quite quickly in 5th (engine retarding timing perhaps?).

Now a little background, the car has been boosting to over 1 bar for about a month or so (that I have noticed, it may have been this way when I bought it about 4-5 months ago), however I only drive it once or twice a week (and have not been going WOT in the higher gears pretty much at all due to this) and have been planning on fixing this. This is the first time I believe the gauge has actually been pegged in 3rd and 4th however. Normally it seems to just almost peg out in 5th and just over a bar in 3rd and 4th. I did plug the hose that ran to the EPBV valve with a golf tee for the time being, so I am sure that this is not the problem. Where should I begin looking for the source of this? What is the best way to check the wastegate and other boost hoses? Sorry for the long reads guys, hoping to get this sorted here soon! Thanks!

P.S. I got up to around 35 mph-40 mph and went WOT in 5th to test the clutch, the car just bogged a little and accelerated very slowly, so I am assuming the clutch is fine. Someone correct me if this is the wrong procedure for testing clutch slippage.

Best Regards,

-Erik E.

1994 Esprit S4

<{POST_SNAPBACK}>

I had the same when I removed my EBPV. Sorted mine by resetting ECU.

Your clutch test method is the same as I've always been told.

[Kato]

You need to run FreeScan on it to see what the ECU's doing and how the engine's running.

[hotrod3]

You did plug your vacuum hose to the EPBV right? You might check your overboost connections also.

Hey Guys,

Last night I removed the EPBV valve and went for a little run to hear the exhaust without the muffler (which makes this car sound as it should, btw, can't wait to put a full exhaust on). It seemed fine out of first and second gear, however once I got to third I noticed the needle on the boost gauge was pegged, same for 4th and 5th gear. The car seemed to quit accelerating once this happened and the revs just stayed high without much change in speed, when normally she accelerates quite quickly in 5th (engine retarding timing perhaps?).

Now a little background, the car has been boosting to over 1 bar for about a month or so (that I have noticed, it may have been this way when I bought it about 4-5 months ago), however I only drive it once or twice a week (and have not been going WOT in the higher gears pretty much at all due to this) and have been planning on fixing this. This is the first time I believe the gauge has actually been pegged in 3rd and 4th however. Normally it seems to just almost peg out in 5th and just over a bar in 3rd and 4th. I did plug the hose that ran to the EPBV valve with a golf tee for the time being, so I am sure that this is not the problem. Where should I begin looking for the source of this? What is the best way to check the wastegate and other boost hoses? Sorry for the long reads guys, hoping to get this sorted here soon! Thanks!

P.S. I got up to around 35 mph-40 mph and went WOT in 5th to test the clutch, the car just bogged a little and accelerated very slowly, so I am assuming the clutch is fine. Someone correct me if this is the wrong procedure for testing clutch slippage.

Best Regards,

-Erik E.

1994 Esprit S4

<{POST_SNAPBACK}>

Edited January 20, 2006 by hotrod3