7.3 maintenance and starting issue.

[sinnful_46534]

Well let me start with my first problem. Truck was acting fine with no issues. Pulled it into our shop. Put a mbrp 5 inch exhaust on. Went to start the truck and it turns over but will not fire. I noticed I have no wait to start light come on like usual. Any suggestion on what to check? It is a 2000 Also while I am at it I would like to ask this. I have only owned the truck about 2 months. So far as far as maintenance I have done as follows. Fluid change in front and rear ends. Oil and fuel filters. New radiator, water pump, heater core. I am getting ready to flush the transmission. Is a new torque converter drain plug recommended or can I reuse the old one. Also what other things am I forgetting to check. Thank you in advance for any advice.

[NoRalPh]

Are you saying you do NOT currently have a WTS light? And you usually DO? If that's the case....

Check Fuse #30.

If it's blown replace it and see if your WTS light comes on.

If it blows again, or really in either case, unplug the heater element at the bottom of the fuel bowl/water separator.

#30 shares the PCM and that heater

[chillls]

cant help with the no start issue but hows the clearance at the spare tire with the 5" exh?

[sinnful_46534]

Will check the fuse now. I had more of a clearance issue with the passenger side shock then I did anything. No issues at all with the spare tire.

[sinnful_46534]

NoRalPH. Yes what you are saying is correct. I previously had a wait to start light and now I do not. I was just mentioning that because I wanted to provide all information that I can. The fuse that you suggested to check turned out ok. I am just at my wits end of what could have happened in the 2 hours the truck was turned off.

[NoRalPh]

The lack of a WTS Light is an indication that the PCM is not running (it will Never start...)

So, now you've gotta figure out why it's not.

Time to check ALL fuses (there are actually more than one that are PCM related) I'm not sure what the exhaust could have done, but retrace where you worked, what you might have moved. Is there any other electrical system not working that could help you find an open fuse? Look at #19 closely.

Check the computer plug, at the firewall itself. There is also a fuseable link connector that you might have (not sure about a 2000) that I had trouble with here -> POTENTIAL ELECTRICAL CORROSION if your truck is like mine...... that would kill the power to the PCM.

Somehow it's not "awake" and communicating with the engine. You'll know when it is by the return of the WTS.....

[Zaairman]

Unplug your fuel bowl heater. It's the little white plug on the back side of your fuel bowl,with two wires going to it. Replace fuse #19 or #30, I forget. Same thing happened to my 2000. Just cause the fuse looks good, doesn't mean it is. Replace it anyways. They're cheap.

Chills, clearance is tight, but I haven't had any problems with it in the 3 years I've had mine.

[sinnful_46534]

Thank you for the help. Ended up being an issue with a tune that didn't take. Problem is solved now.