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Is it my MAF?


Xandor

Well-Known Member
Supporting Member
TRS Banner 2010-2011
Joined
Oct 27, 2009
Messages
368
City
Bloomfield IN
Vehicle Year
88, 89, 89
Transmission
Automatic
Ok I think I know whats wrong with my 93 4.0 2wd ranger but I wanted to check befor I droped 80$. My Ranger always runs bad when I start it, sometimes dies. But once it gets going it fine. But the problem always comes back at the same paces on the highway every single time. I drive about 20 miles to work and in the middle of or RIGHT after I go up or over a big hill it just looses all power. I have to pull over to let everyone by, I sit there for a while and after about 45 secs of idle or somethimes after restarting it will let me get on the gas with out learching. When it loose's all power and just wont rev up I notice if I put it in neutral it will rev up fast as you want it to, soon as you put it back in drive it just bogs down.
 
I did. It said the 02s were burning rich. I replaced em and it did help, but didnt fix it totaly and it still has the same readings.
 
If the O2 is rich, that indicates a problem upstream.
fuel pressure reg could be bad, pull the vacuum hose and smell for gas.
Coolant temp sensor, air temp sensor, or MAP sensor could be bad.
Get a digital multi tester, and go to work checking those.
 
Fuel filter or vacuum leak might be worth looking at.

Not with a rich running problem they aren't. Both of those will cause lean conditions.

Check MAF, coolant temp sensor, and FPR. Those should be your main suspects.
 

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