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Old 09-10-2011, 02:04 PM
grossebarbe grossebarbe is offline
Join Date: May 2010
Location: laval, canada
Posts: 8
Default Hesitation at WOT

I'm running an 1987 Buick Grand National with TE44, Powerstroke IC, 3000RPM Stall, Mototron 60lbs per hr, Razor Alky, PowerLogger, Wideband LC-1, TurboTweak 6.0. I'm running 22 psi of boost on 94 octane with the alky.

Yesterday, everything was fine and now at WOT, the engine is having major hesitation. Boost is normal at 22psi then drop to 9psi for an instant and goes back to 22psi for maybe 1 second and drop back to 9psi. While this happened AFR, engine speed, MAF, timing, and injectors PW, all follow the same up and down pattern.

The attached PowerLogger file is showing that from second 744 to 748.

Any help diagnosing that would be greatly appreciated.

Attached Files
File Type: zip 10sept2011.zip (733.7 KB, 628 views)
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Old 09-10-2011, 03:29 PM
Eric M Eric M is offline
Join Date: Aug 2004
Posts: 65

If I had to guess, I would say either an intercooler hose is blowing off, or your MAF is dying.

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Old 09-11-2011, 03:59 PM
grossebarbe grossebarbe is offline
Join Date: May 2010
Location: laval, canada
Posts: 8

Your guess was right. It was an intercooler hose issue. It's now fixed. Thank you Eric.
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Old 09-14-2011, 12:33 AM
Rick87gn's Avatar
Rick87gn Rick87gn is offline
I spend too much time here
Join Date: Nov 2005
Location: Mokena, Il
Posts: 1,216

Nice call Eric!
**87 Buick GN**
109 block steel crank/mains
Ported Irons roller cam/rockers
Ported intake/acufab plenum PT front mount
70GTQBB 83lb injectors Razor alky
Maf Translator pro/LC-1 WB
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