Devin00235
Registered User
Truck cranks but is knocking it’s 1987 6.9 idi will not fire up just cranks
Knocking when cranking
- Thread starter Devin00235
- Start date
renjaminfrankln
Full Access Member
Does it try to catch at all... can you give a better description of the knocking. Any smoke coming out? How cold is it, and do the glow plugs work?
Devin00235
Registered User
They figured it out I guess it was a small wiring issue
Oledirtypearl86
Full Access Member
What was the wiring issue ?
renjaminfrankln
Full Access Member
Well if it turns over only wiring issue I guess would be cut off solenoid. Possibly glow plugs if it was cold enough.
Devin00235
Registered User
I’m not sure guys they just told me they got it running I guess it was something to do with the starting wires I’m not sure how because it cranked really fast
Devin00235
Registered User
Glow plugs were definitely an issue the motor is 1984 6.9 idi I don’t think they’ve ever been changed I’m changing them tomorrow what are the chances there all gonna be swollen
Golden Helmet
Full Access Member
If they're the correct Motorcraft / Beru plugs, you will probably be ok. If someone has changed the plugs before and put in Autolite or anything else, you're probably not going to have a fun afternoon.
Go slow, don't be shy with the penetrating oil, and don't use anything other than Motorcraft / Beru plugs.
Pretty much sums it up. If a plug is real tight just soak it with penetrating oil and gently try to work it loose a hair--once loose use more oil and work the plug back and forth to help distribute the oil. I had several very tight Autolite plugs to remove but in the end they all came out. This is not a "bigger hammer" type job. Patience is your pal!
