Question about 6.9 hard starting and lack of power - Ford Powerstroke Diesel Forum
6.9L IDI Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

 
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post #1 of 5 Old 12-08-2010, 05:10 PM Thread Starter
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Question about 6.9 hard starting and lack of power

The local dog groomer has a 6.9 IDI that is hard to start and lacks power. I thought I'd kill an afternoon and try to help out.

Do these engines have a glow plug relay that could be shot? Is it easy to access and test with a voltmeter?

Can I test the glow plugs with an ohm meter without removing valve covers?

Any other suggestions of what I could check that would cause hard morning starts or lack of power?

Thanks!!

Mark.

---

Elizabeth, Colorado.
2001 7.3 LWB 6spd crew cab Lariat stock engine.
Guzzle's GPR mod: http://bit.ly/dZL45k
In-dash LED connected to GPR to indicate when glowplugs are on.
In-dash LED connected to AIH. One day maybe it'll actually turn on.
Pioneer AVH-P4200DVD sound system/DVD player with Sirius and DVD disable bypass mod.
Black CPS IH Pn 1825899C93 ordered from Guzzle
TODO:
Upgrade fuel line clamps.
Build dash mounted all-speakers-mute switch.

Last edited by torq; 12-08-2010 at 05:11 PM. Reason: edited for clarity
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post #2 of 5 Old 12-08-2010, 05:22 PM
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6.9 IDI the glowplugs are installed into the heads like a sparkplug, Also the injectors are external of the valve covers too. It has an injection pump on the top of the engine it is driven by a cam gear off the timing gears.

This engine is nothing like a 7.3L psd that is under the hood of your truck.

I strongly suggest getting a manual on this truck and engine.

Hard starting lacking power, start with fuel filter, poor fuel supply will cause this. If it is running rough you can crack open each fuel line at the injector. Listen for an unchanged sound while the engine is running. If you do hear a change in the engine running then tighten that injector line. Then move onto the next injector line.


Your Actions Today, Decide Your Future Tomorrow

2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #3 of 5 Old 12-08-2010, 08:42 PM Thread Starter
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Quote:
Originally Posted by bigcountrysg View Post
6.9 IDI the glowplugs are installed into the heads like a sparkplug, Also the injectors are external of the valve covers too. It has an injection pump on the top of the engine it is driven by a cam gear off the timing gears.

This engine is nothing like a 7.3L psd that is under the hood of your truck.

I strongly suggest getting a manual on this truck and engine.

Hard starting lacking power, start with fuel filter, poor fuel supply will cause this. If it is running rough you can crack open each fuel line at the injector. Listen for an unchanged sound while the engine is running. If you do hear a change in the engine running then tighten that injector line. Then move onto the next injector line.
That's great, thanks for the help! Sounds like a much older design and the manual suggestion is a good one. I'll pass a link to your suggestions on to the owner.

Mark.

---

Elizabeth, Colorado.
2001 7.3 LWB 6spd crew cab Lariat stock engine.
Guzzle's GPR mod: http://bit.ly/dZL45k
In-dash LED connected to GPR to indicate when glowplugs are on.
In-dash LED connected to AIH. One day maybe it'll actually turn on.
Pioneer AVH-P4200DVD sound system/DVD player with Sirius and DVD disable bypass mod.
Black CPS IH Pn 1825899C93 ordered from Guzzle
TODO:
Upgrade fuel line clamps.
Build dash mounted all-speakers-mute switch.
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post #4 of 5 Old 12-09-2010, 08:27 AM
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Quote:
Originally Posted by torq View Post
That's great, thanks for the help! Sounds like a much older design and the manual suggestion is a good one. I'll pass a link to your suggestions on to the owner.

Mark.
No problem man, you may also want to check fuel supply if the fuel filter does not resolve the problem. You may want to see if it is getting ample supply of fuel. You may need to drop the tank and check the fuel sock in the tank. Being it is an older truck the fuel sock may be clogged up and needs replacing.

Or it may need new injectors, or the fuel injection pump may not be supplying the proper fuel pressure to the injectors.


Your Actions Today, Decide Your Future Tomorrow

2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #5 of 5 Old 12-09-2010, 09:08 AM
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Good info already. Also, this is a N/A IDI, they are rated 170-175hp from the factory...so they are going to be underpowered.

If you can get it to start, tell us what kind of smoke it makes. White, black, grey, blue. 6.9's have a crappy controller that likes to fail in the on position, so it fry's the glow plugs. I was lucky enough to have it fail in the off position. Only use motorcraft/Beru glow plugs, ONLY!

Also, timing can play into hard starts/low power, that would indicate retarted timing.

-Justin-
1985 Ford F-250 with a 6.9 IDI/T-19 4speed 4x4
Paint, Eagle Alloys, Kelly Safari TSR's, ATS turbo, gauges

2004 Jetta TDI 5 speed
2004 2wd Excursion Limited 6.0. Testing how loyal I am to Ford
1997 Passat B4V TDI. 1 of 80 imported in 97. 50 MPG and a factory 25 gallon fuel tank!
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