Please help with camshaft synchronizer!!

[Eddo Rogue]

Finding my Cam synchro was a PITA because it is discontinued. I ended up going aftermarket, which lasted about 200 miles, then tracked down a NOS motorcraft unit on fleabay. So I've done my Synchro twice lol. Old parts were ceremoniously tossed in the trash.

 

[Tsestak45]

Ron D I'm going to run those tests after work and will post results pictures. I know the other day when I "blipped" the engine that I went from 16-0-20 in Hg respectively so I'm guessing the exhaust is not the problem. Also because I took the CAT off and cleaned it the other weekend so I'm 90° certain that it's not restricting any airflow. Also last night when trying to track down a vacuum leak I can hear coming from the back of the manifold (any ideas where) I noticed that one of my fuel injectors connectors wasn't even plugged in??!? Would that cause a CEL? I would like think the computer would realize it has no communication with an entire I jector and also that it's not firing at all?

 

[RonD]

in a 1998 yes unplugged injector would for sure cause CEL to come on and code

Look here: https://www.therangerstation.com/tech/obd-ii_trouble_codes/
At the start of the P0200s

 

[Tsestak45]

Yea so why no code for me? I'm assuming that's not good at all

 

[Tsestak45]

Here's all my #s at idle. Jumps around between 750 and 825 at idle. Right around 17 in Hg

 

[RonD]

MAF sensor is way off, at idle(800rpms) 3.0l engine should be 3.3-3.7 G/S, 4.0l engine 4.3-4.7 G/S

General rule of thumb for MAF is 1 G/S per liter of displacement at 500rpm
So 6L engine would be 6.3-6.7 G/S at 800rpm, and you don't have a 6L engine, lol


Throttle sensor should be 16-19% when throttle is closed, not a big deal, but 23% is wrong at idle

O2s seem to have no voltage, all are 0v, so none of the % are reliable

Fuel system A "CL-Fault" usually means computer can't do Closed Loop, from data shown it would most likely be from O2 sensors lack of feedback

Temps look fine
Spark timing is fine

 

[Eddo Rogue]

Based on what Ron said, I'd look at the MAF sensor. They do get drty/go bad. Mine have more than once.
And the symptoms vary but all the same: truck runs, but like crap...and usually no CEL either.

 

[RonD]

Try key on engine off and look at MAF sensor data, should be 0 G/S of course

 

[pjtoledo]

Based on what Ron said, I'd look at the MAF sensor. They do get drty/go bad. Mine have more than once.
And the symptoms vary but all the same: truck runs, but like crap...and usually no CEL either.

both TPS and MAF use the same reference voltage. a quick voltage check may be in order.

 

[mc17eln]

@Tsestak45 I read this thread late, but here are some of my posts on the cam synchronizer:

https://www.therangerstation.com/fo...osition-sensor-syncronizer.92020/post-1876454

If your engine starts and doesn't misfire badly, your cam timing is good.