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Low boost, no power

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Old 05-23-2014, 08:00 PM
lemonshindig lemonshindig is offline
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Low boost, no power

I have 8 stage-1 injectors from Rosewood installed that are about a month old. There is no sign of oil in the coolant or oil in the fuel bowl. I just changed the oil and filter. The air filter is not dirty. The fuel filter is spotless.

It passed a coolant system pressure test.

I was unable to complete a compression test because my adapter is too fat to install. What I do know is that the 3 cylinders I checked have "at least" 320psi at idle. I couldn't get the compression tester threaded in far enough for the o-ring to seal.

Symptoms: No power, rough running under WOT, doesn't like revving past 2k, blows white smoke if you try to make it.

Monitored on my last drive (torque pro and gauges for HPOP and boost)

Boost: 0-4 psi. 4 psi is at WOT and only when it feels like it. It was pretty normal to get less than 2 psi. These readings were confirmed by both my MAP sensor and my mechanical boost gauge.

HPOP: 600psi at idle to around 2400-2500 WOT. Confirmed by both the ICP output and my mechanical gauge.

IPR duty cycle idled around 12-14 and never went over 40% for WOT.

Engine oil temp 60-80 degrees C. Seemed normal to me.

Injector pulse width: about 1600 micro seconds at WOT.

EBP: usually just a few psi higher than the intake. Never exceeded 22psi.

I have only found one bad exhaust or intake seal:

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'88 F-250 6.9 IDI ZF-5 4x4 Standard Cab ?? Miles
'94 F-250 7.3 PSD ZF-5 4x4 Standard Cab 374k Miles
'67 Mustang 289 C4 "Who Cares?" Miles
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Old 05-24-2014, 12:24 AM
Join Date: Mar 2004
Posts: 3,195
MOOSE_MACHINE has a good reputation on FTE.MOOSE_MACHINE has a good reputation on FTE.
How do you know you have a bad exhaust or intake seal. And did you do a compression test with the truck running?
Sometimes your the windshield, sometimes your the bug
1997 F-350 xlt cclb PSD 4x4 zf5, 160/80's, custom tunes, T500, DIY e-fuel, 6.0 i/c, 38R, 3" plenums, gauges, 4" turbo back exhaust, diy bellows, south bend clutch
1992 F-250 2wd eclb 5.8 farm truck
1989 F-350 4x4 7.3 c6 auto retiread
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Old 05-24-2014, 06:25 AM
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ReBilld ReBilld is online now
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ReBilld has a great reputation on FTE.ReBilld has a great reputation on FTE.ReBilld has a great reputation on FTE.ReBilld has a great reputation on FTE.ReBilld has a great reputation on FTE.
The correct way to do a compression test on these engines is to remove all 8 glow plugs and test each cylinder while craning the engine over about 5-6 revolutions with the key. Remove fuss 22 while doing this.

'95 F350 CCLB 4x4 dually,ZF 5spd,4.10,Rosewood Stage 2s,T500,S366,IC,Tony Wildman tunes,e-fuel,6637,CCV mod,3.5" DP,Diamond Eye 5" exhaust,Valair clutch,IH water pump,Scangauge,GlowShift gauges
'92 F150 RCLB 4x4, 4.9 6cyl., 5 spd., daily beater
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