4.0L underwhelming at full throttle.

[Flashflood]

The 93 has been seemingly been acting weird as of late. When it goes to getting on the highway it will sort of bog down and barely be able to make it up to 65mph no noise no check engine light. It just bogs like it's reached a governor or something.

 

[BrooklynBay]

Replace the fuel filter, and add fuel injector cleaner. Clean the mass air flow sensor, and the intake.

 

[Flashflood]

Update it was a really bad missfire that ended up with a spark plug literally exploding on us. Will be taking care of a tune up in the next couple of days.

 

[410Fortune]

Good idea to check fuel pressure after you verify all plugs and wires in good order

 

[BrooklynBay]

Check the compression on that cylinder, and compare it to the other cylinders.

 

[ProjectAviator]

Took care of the plugs and wires. Now she is putting white smoke out of the tailpipe. Possible head gasket, crap. After putting out 3000+ for a transmission rebuild. Now we have to do head gaskets.

 

[Josh P]

That's a miserable job.

 

[BrooklynBay]

Try a stop leak such as Bars in the cooling system before you do the head gasket. It might work.

 

[ProjectAviator]

Try a stop leak such as Bars in the cooling system before you do the head gasket. It might work.

I just may try it. wouldn't hurt.

 

[BrooklynBay]

I've used Lucas stop leak in oil & power steering fluid, and it worked. It saved a lot of time & money.

 

[410Fortune]

How hard is it to get the intakes and heads off in the van? Pita or easier than the truck?

I’m not afraid of doing heads and head gaskets on ohv! Good idea to have some spare lifters pushrods and rocker arms on hand

 

[Josh P]

There isn't much space above the intake, just a few inches at the back where the body of the van is over the engine. The doghouse helps with rear access. Once the valve covers and intake comes off, there's plenty of room. Using a floor jack to lift the body off the subframe isn't too much additional work and a few more inches is like miles of space.

 

[ProjectAviator]

Did the bars leak. Even starting it just after adding it. No white smoke. Even after letting it run for about 20-25 min. I took it around the block. She still runs rough, but better than before the plugs and wires. My wife drove it the day after. No smoke or anything. It probably needs the MAF sensor cleaned. I also plan on running some seafoam through the engine.

Thanks for all the help.
Tim

 

[BrooklynBay]

The Bars stop leak saved you from doing that job. That's good to know that it worked. Install iridium spark plugs, and let us know how they work.

 

[ProjectAviator]

Yeah, that is what I put in her. Iridium plugs.

 

[ProjectAviator]

How difficult is it to do injectors on the 4.0 Aerostar?

 

[BrooklynBay]

There's limited space to work but it's possible to do.