Hard starts and weird tach

[Nathan Croxton]

Lets say the fitting at the back of the head can be reach much easier with the valve cover off. I've got big hands so that extra bit of room really does count. Number 6 cross over tube is also in a tough spot too. If you pull the hoist ring off you can get #6 in and out much easier.

Thanks for the tip. I dont have huge hands but anything to make it easier. I am pretty sure I am losing prime somewhere. The issue went away with a full tank. except for the RPM issue of course. 

[Nathan Croxton]

Well I put the new crank sensor in and the tach is still acting up. I am starting to run out of ideas. 

[CTcummins24V]

002.MOV

 

Don't mean to hijack, but since we're talking about tachs, is this normal? It's bounced a little for 2 years in idle.

[CTcummins24V]

Well I put the new crank sensor in and the tach is still acting up. I am starting to run out of ideas. 

 

Rear diff sensor? Do you have a movie of the tach in action? I have had tach issues twice, once was the rear diff sensor and the other is when I had the stock lift pump wired wrong and it would run when my fuel boss was running and my tach would go haywire.

[Nathan Croxton]

I can try to get one up tomorrow. It stays consistent it moves up really fast. with light throttle it goes all the way up to 2200 rpm and at 65 mph it usually stays at 2800 rpm or so... Could it be my comp box? The speedo seems to be fine. At idle it reads about 100 rpm

[CTcummins24V]

Make sure you get an oem one, $30 on rockauto. I put one in from O'Reillys and it was defective...

[mopartechnician]

A rear wheel speed sensor has nothing to do with the tach

[CTcummins24V]

A rear wheel speed sensor has nothing to do with the tach

 

It counts rotations correct? Or is it just for the ABS module?

[Nathan Croxton]

I guess it could be bad. wouldn't it throw a code though.... I never had a code before though

[mopartechnician]

It counts rotations for your vehicle speed (mph) not engine speed (rpms)

[Nathan Croxton]

Any ideas about my tach?

[Ilikeoldfords]

Maybe the gauge cluster is bad? I am not sure how common they are to fail though. Do you have a buddy you could trade with to see if the problem continues?

[Nathan Croxton]

Well on my way to work today the rpm issue went away. However All at once I got a check engine light, water in fuel light , and check gauges light. My oil pressure dropped down to zero for five seconds or so then went back to normal. It did this about five more times. The water in fuel light went off after I opened the drain valve on the fuel filter housing and hasn't come back on. On my way home oil pressure never dropped and the water light never came on and the tach worked  fine. I pulled these codes once I got home  P1488, P0236, P0382, P0238, P0522, P0177. Not sure why all that happened at once

[mopartechnician]

How much stuff do you have on your key ring? To me it sounds like an ignition issue. Did you have the fan running or radio on? Or could be a connector issue

[Nathan Croxton]

I had the heat on and radio... It was 6 degrees today.

[mopartechnician]

Did any of those shut off when this happened?

[Nathan Croxton]

no everything worked as normal. I checked the oil when I got to work and it was good. nothing weird happened other than the gauges

[Nathan Croxton]

Well this weekend I got on mopar1973mann's database and checked my codes. Since I had the p1488 I did the test procedure that he recommends, and I came up with my MAP sensor being bad. I should have it in a few days. I will let everyone know what happens.

[Nathan Croxton]

The crank sensor fixed the tach, it just took a day for some reason... all the other codes were fixed with a map sensor. 

[MnTom]

So now it starts like it should?