Running really rich

[rusty ol ranger]

Im thinking about getting another new set of plenum gaskets and pressure test my old injector and clean them and throw them back in just to see if tjat changes anything

When you tighten the plenium...finger tighten the 6 bolts, then torque to 7ftlbs. Then go back and tighten to 18ftlbs.

I started with the two middle bolts, then went back passenger, front driver, front passenger, back driver.

Personally id try changing the MAP first...it would have to be a MASSIVE plenium leak to get the ecm to dump that much fuel...and it would likely idle higher then hell and show other vaccum leak symptoms. Your fuel pressure being a bit low could mean the injectors arent closing totally...but its not that low.

If the computer sees a reading of 0 from the MAP its going to think youre pulling the guts out of it and dump fuel

 

[Bugga390]

Ok i will make sure to torque the plenum correctly i have tried three different map sensors one used and two new with no difference and a new eec im going to check the new injectors just to make sure thet were not bad out of the box, i realy appreciate all the advice i have ran my own shop for 24 years and this is the first vehicle that has given me this much trouble luckily its personal and not a customer

 

[89longbed]

Hope everyone is okay with me reviving a slightly old thread, but I didn’t see anything about which spark plugs showed a cylinder running rich. Has the problem been fixed? The spark plugs could indicate if all injectors are dumping fuel, one cylinder bank (grounded wire?) or just a few cylinders.