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Old 05-22-2017, 01:39 PM
Zainal Zainal is offline
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Join Date: May 2017
Posts: 3
Default 4.0 sounds like a diesel with none of the power you would expect from one

after searching forums back over 2 years of postings and not finding my answers i decided to make my own post. I bought a 94 B4000 and looking to get it up and running properly. it eats oil, has a misfire, sounds like a diesel when warmed up, under load, and at speed, has next to no power in the top end, and has an oil saturated air filter. seafoam has been run through tank, flushed out crank, and run through throttle body. carb cleaner through purge line as per ford TSB and of course a filter and oil change.
PVC appears to be working but changing anyway as it's fairly dirty (even after soaking in carb cleaner)
first step is a compression test to see if the oil is getting past rings or valves to see it the motor is even salvageable and I'm having the truck go into my mechanic if the rings pass the compression checks to see if there is any other issues i missed.

my only concern is the amount of blow by and fumes i get from the oil fill, on my 97 Lexus i could bloody well fill it with oil whilst it was running, this sucker would shoot any attempt directly into the underside of the hood.

idles rough, runs fairly rough and as mentioned, sounds like a diesel under load

to top it off I'm thinking i might need to replace the torque converter as it shudders bad once the drivetrain locks at highway speed

i got it at a decent price though and the body and interior is absolutely cherry, zero rust on the body and not a single chip in the paint, the frame is also in good shape with the rear hangers being the worst of it but still plenty of metal left to hold it together. The truck overall handles like new and the suspension is in great shape, 4x4 works as it should and all this lets me think it's worth putting work into.

if anyone knows anything that will help me out and save me some money I would appreciate any advice i can get.

thanks heaps
94 b4000 on a wing and a prayer
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Old 05-22-2017, 02:33 PM
cowboybilly9mile cowboybilly9mile is offline
Ford Ranger Driver
Join Date: Mar 2010
Posts: 4,897
Default Re: 4.0 sounds like a diesel with none of the power you would expect from one

You mentioned "my mechanic", which suggests uncertainty in your diagnostic ability, so with this in mind, it's unclear how much value replies will have, unless of course nothing at all becomes of them other than burning bandwidth. With that in mind, maybe just take it to the guy now.
2004 Ranger FX4 Level II, 5R55E, Sonic Blue Pearl

Proudly JAP/RICE free since March 2000
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Old 05-23-2017, 08:16 AM
2trux 2trux is offline
Found, 89 4X4
Join Date: Jul 2014
Posts: 91
Default Re: 4.0 sounds like a diesel with none of the power you would expect from one

Huge blowby and misfire could indicate a hole in the piston. It will be interesting to see what kind of compression results you get. The diesel sound you have could be rod knock or piston slap.
1989 Ranger Extended Cab, 2.9L, 8.8/3.73 LS, 4X4
1997 Expedition, EB, 5.4L, Air Ride, 4X4
2005 Explorer, Limited, 4.6L, 4X4

Last edited by 2trux; 05-23-2017 at 08:20 AM.
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4.0 ohv, bagged truck, rough idle, valve noise

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