1990 2.9L Manual - Stalls in First gear, won't move its own weight.

[Boulter]

Id check compression next..just to rule that out.

Will check compression this weekend.

 

[Boulter]

Will check compression this weekend.

 

[Boulter]

Compression looks like this...
212.0, 186.0, 193.5, 186.5, 199.0, 193.0

Seems high, perhaps we did something wrong. Used Mighty Vac Digital Compression Tester MV5532. High is ok? Low is bad?

 

[Brain75]

was that wet or dry?
another thread here folks discuss what seems reasonable:

what should compression numbers be on a 2.9l

I just picked up a 1987 ranger 2.9, its missing a few things so i decided to do a compression test before i fixed it up. my results were 120 on 3 cylinders, 115 on one cylinder and 110 on two cylinders. I was wondering if these numbers are ok. I know the general rule is no more than 10%...

www.therangerstation.com

the TL/DR; version is gauges have a lot of variance - do you have a history and feel for that specific gauge?
DIFFERENCE is also a biggie - your high-low = 26 if I did the math right...
and MINIMUM is also a biggie, over 90 so you have enough compression to actually ignite when cold.


My hunch is still that your engine is fine, and your issue is in the drivertrain (somewhere between clutch and tires) not engine. I'm betting transmission from your testing so far.

 

[bobbywalter]

disconnect the map sensor

 

[rusty ol ranger]

Compression looks like this...
212.0, 186.0, 193.5, 186.5, 199.0, 193.0

Seems high, perhaps we did something wrong. Used Mighty Vac Digital Compression Tester MV5532. High is ok? Low is bad?

Yeah thats extremely high.

Usually 120-140ish is what most guys are finding.

 

[Boulter]

disconnect the map sensor

Disconnect while checking compression? We have replaced the MAP sensor, it wouldn't run with the old one in. Swapped it out for a new one and the truck now runs.

 

[bobbywalter]

disconnect it and see how it runs. and you are sure it is getting clean vacuum signal?

 

[Boulter]

Latest update...rear drive train rolls freely

Did koer code test and got 12, 13, and 22.

Wouldn't start after last, removed and cleaned plugs and now able to start. Two plugs have lots of carbon.

 

[bobbywalter]

the vacuum line going to the map sensor is good? straight vacuum?



idle air control and carbon plugs. how bad does it smoke?


really smacks of no load sensing and shit injectors. which is map on these