pcv valve elbow was cracked in 2 different places...seems to be good now

 

funny, i just bought mine, and dropped a j/y 4.0 in it and had the same thing. O2's were laying flat, talked to a tech, and he said that the lower intake mani. gaskets on these 4.0's are junk, so I replaced it. anyway, the thing runs like a champ. Lower intake mani. gasket will run about $120 and took me about 4 hours.

 

Did you go to a dealer?

 

well, my dad works at a dealer, he talked to the techs.

 

i had a similar problem, i replaced the pcv valve, soaked the MAF with cleaner several times and dielectric grease on all the connectors under the hood helped a little. I replaced the fuel filter 3 times in 3 months, and it seemed to help a little. Finally, i had to take off my high flow cone filter and put back on the stock one to get the 'banks running lean' code to come off. Part of MY problem though, was the adapter for the filter had a small gap between it and the MAF housing, right in front of the sensor.

 

I had the same codes on my '99 4.0, it ended up being the MAF, i got a rebuilt one for $100. but it all started when i got the inside of engine a little damp. i replaced the IAC valve (but that threw its own code) and cleaned the TPS (that stopped it from dying and cleared the irratic idle.
No body could figure it out, most said it was a vacuum leak, but i checked everything several times, and after about a month of tinkering, i just bought a new MAF. The only time the code came back on, was about 2 weeks later, i didnt let the engine warm up on a brisk -15 degree morning. its been off for months, and i got my gas mileage back (to 14.5).
Before you replace your O2 sensors, have a diagnostic scan, o2 sensors are something like $80 a piece and the scan will tell you if they're bad.

also: NEVER clean your MAF with brake cleaner,, it's not a brake, is it? it can damage the little sensors inside and then you probably WILL need a MAF (not 100% of the time, but why risk it?), use a mass air sensor cleaner or electrical parts cleaner.

 

Where is the PCV valve at? whats it look liek im kinda confused. and what can you use to safely clean a 97 2.3l MAF?

 

Carb cleaner. Take out the filament/sensor and spray like Hell.

On 3.slos & 4.0 SOHC & OHV:
The PCV (positive crankcase ventilation) on most are on the rear (firewall side) of the left (driver) valve cover, while another ventilation hose connects from your air intake to the left (passenger) valve cover..the driver side PCV connects to the upper intake manifold. One is a small valve and the other that hose.








Take the valve out, and shake it. If it rattles, the ball check valve works. If you don't hear a rattle, there is a carbon/gunk buildup and you need another $5 one from O'Reillys (or whatever).



Pete



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Thank you a lot. ill post tomorow if it made any difference