Fresh build, won’t rev. HELP!!!

[chopper35nj]

Hey guys, haven’t been here in a while, but l am stumped. I just did a fresh engine build for my 89, my block was bad so l got a 1992 block that came with a 1994 ho head. Here are the specs. 030 over, new pistons, new rings, new bearings, new cam, lifters, push rods. Head was plained, fresh valve job, (leak tested) valve guids well within spec, new valve seals. Engine starts and ldles perfectly, won’t rev at all. I have indexed the distributer (new), set the TPS, coil is new as of last spring, new plugs, new injectors (volvo), IAC valve cleaned and functional, EGR functional, fuel pressure 31psi. Vacuum tested 17 inches of mercury at idle. 4 additional and large grounds. HELP!!! Please. 

[dkenitz]

No idea if this applies to your situation, but my perfect idle and misfire on rev problem was solved by a new Mopar CPS.

[Jeep Driver]

which flexplate did you use

[chopper35nj]

Stock 89 flex plate. 

[chopper35nj]

I just checked CPS and got 0.00v plug it back in starts right up, what gives?

[dkenitz]

The old CPS which allowed my truck to idle perfectly yet not rev was worn down and had plenty of clutch material etc. on the magnet.  Testing with a meter gave me false hope as well.  Cleaning it helped briefly but it was too far worn.  I found a new Mopar CPS on eBay for ~$32 so if yours is old or questionable I would suggest replacing.  The local advance auto version did not work and seemed to not fit correctly, FYI.

[Ωhm]

1 hour ago, chopper35nj said:

I just checked CPS and got 0.00v plug it back in starts right up, what gives?

 

AC scale for voltage check.

[chopper35nj]

OK, so how am l getting no voltage and running??? I went and checked it 4-5 times just to eliminate my own personal stupidity and ineptitude from the equasion. 

[chopper35nj]

2 minutes ago, Ωhm said:

 

AC scale for voltage check.

Yep, 200vac. Also checked all other ac volt ranges just to be sure. And, no, it isn’t a cheepo metre. 

[Ωhm]

200vac range is high for this reading. Set a 20vac range. Should see up to 2.5vac reading.

 

EDIT: I see you changed ranges.

[chopper35nj]

Yep, checked every voltage range. Got nothing but zeros. 

[chopper35nj]

Anybody have the part number for the MOPAR CPS for an 89 4.0?

[HOrnbrod]

33 minutes ago, chopper35nj said:

Anybody have the part number for the MOPAR CPS for an 89 4.0?

 

T0739789

[chopper35nj]

Thanks HOrnbroad, any opinion on the crowne automotive part?

[Jeep Driver]

https://www.factorychryslerparts.com/products/Jeep/SENSOR--Engine-Speed-1987--SENSOR--Engine-Speed-EFI-Engine/4605308/T0739789.html

 

https://www.moparpartsgiant.com/parts/mopar-sensor-g~t0739789.html

 

 

[Jeep Driver]

https://www.ebay.com/itm/Jeep-CHRYSLER-OEM-1987-Cherokee-Vehicle-Speed-Sensor-VSS-T0739789/222681283505?epid=83250821&hash=item33d8d6bbb1:g:i-gAAOSwVA5Z5c1u

 

[HOrnbrod]

2 hours ago, chopper35nj said:

Thanks HOrnbroad, any opinion on the crowne automotive part?

 

Junk. C.R.A.P. part.