Low boost, no power - Ford Truck Enthusiasts Forums

1994.5 - 1997 7.3L Power Stroke Diesel  
Sponsored by:
Sponsored by:

Low boost, no power

Thread Tools Search this Thread
Old 05-23-2014, 07:00 PM
lemonshindig lemonshindig is offline
Elder User
Thread Starter
Join Date: Feb 2010
Location: Port Orchard, WA
Posts: 846
lemonshindig is starting off with a positive reputation.
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:

Reply With Quote
Old 05-23-2014, 11:24 PM
Join Date: Mar 2004
Posts: 3,830
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?
Reply With Quote
Old 05-24-2014, 05:25 AM
ReBilld's Avatar
ReBilld ReBilld is offline
Post Fiend
Join Date: Jan 2012
Location: Southern West Virginia
Posts: 10,976
ReBilld is a splendid one to beholdReBilld is a splendid one to beholdReBilld is a splendid one to beholdReBilld is a splendid one to beholdReBilld is a splendid one to beholdReBilld is a splendid one to behold
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.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Blue Spring or New Fuel Pump Simps 6.0L Power Stroke Diesel 4 03-23-2017 07:01 AM
Help: Extremely low fuel pressure at WOT - 20 PSI exbxtoy 1999 - 2003 7.3L Power Stroke Diesel 62 02-03-2017 09:29 AM
Help....Rolling Coal and don't want to AllaboutMPG 1999 - 2003 7.3L Power Stroke Diesel 49 09-07-2016 07:33 PM
6.0 fuel issues brandon. 1999 to 2016 Super Duty 5 08-15-2016 03:51 PM
Fuel pressure dropped evan1242 6.0L Power Stroke Diesel 77 09-14-2015 08:49 PM

Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -5. The time now is 10:35 AM.

  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: