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Old 03-14-2011, 12:26 PM   #1
metalfloyd123
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Default Car wont go past 4k rpm

I have swapped a B230ft engine out of a 760 turbo wagon. Saturday I went out to drive and up the boost a little. The car was hitting 11psi and running great. When I started heading back to the house the car started bucking and stuttering once I hit around 5100rpm in 2nd and 4000rpm in 3rd and 4th.

I have new plugs in I checked them and they look fine. I don't see any vacuum leaks or any leaks in any hoses. The car runs fine up to those rpm and it’s only hitting about 5psi. Could this be a timing issue?
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Old 03-14-2011, 01:48 PM   #2
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AMM become disconnected? Maybe an air or vacuum leak?
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Old 03-14-2011, 02:27 PM   #3
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Overboost switch kicking in? Maybe the AMM to turbo hose is collapsing under extreme vacuum.

Try driving granny-like and building the boost slowly. If the car suddenly resolves itself, probably your AMM-turbo hose is collapsing (especially if you can squeeze it with your fingers with the engine off and cold).

Also, your cbv might be malfunctioning, though if that's the case you'll probably need to jury-rig the Audi/Bosch CBV as the pierburg "golden pipe" (it cost like 500 bucks when it was available) is no longer available from Volvo. A thread about this:
http://forums.turbobricks.com/showthread.php?t=137666

Alternatively is the Forge CBV

http://www.forgemotorsport.com/conte...oduct=FMCL007P
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Old 03-14-2011, 02:40 PM   #4
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I have removed the CBV for a BOV. The intake pipe is steel pipe. Ill check the amm connection after work. I have hit fuel cut before and this feeling is different. Where the fuel cut it more abrupt this is more of a shuttering.

I had been driving for several miles hard before this started and during that time everything was fine. I checked the volt meter and the alternator seems to be working fine as well.
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Old 03-14-2011, 04:28 PM   #5
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Check your IC hoses.
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Old 03-14-2011, 04:54 PM   #6
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Check your plugs, wires, cap and rotor. Could be spark blowout from worn out parts that just now gave up the ghost.
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Old 03-14-2011, 09:05 PM   #7
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Quote:
Originally Posted by scottyd View Post
Check your IC hoses.
Yep that was the problem don't know how I missed it the first time I looked things over.



Thanks for the help guys!!!
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