96 2500 7.4 long crank at start

**2500brick** · 03-23-2007, 01:31 PM

Sburban cranks 5 to 10 sec.befor it starts.Have installed new plugs,wires,and fuel filter.No help.Runs fine after it starts.

**TrailLeadr** · 03-23-2007, 01:38 PM

Originally Posted by 2500brick

Sburban cranks 5 to 10 sec.befor it starts.Have installed new plugs,wires,and fuel filter.No help.Runs fine after it starts.

Is this something that it just recently started doing?

Once the engine has been shut down after running, if you start it again does it still take as long to start? For instance, shut it off, and restart within 5 minutes.

**Cableguy** · 03-23-2007, 06:45 PM

Originally Posted by 2500brick

Sburban cranks 5 to 10 sec.befor it starts.Have installed new plugs,wires,and fuel filter.No help.Runs fine after it starts.

I didn't see cap and rotor in there?? Did you change these?

**2500brick** · 03-26-2007, 11:08 PM

It will restart if I try right away.If you even waite a min. it may not.The cap and rotor have been changrd also.

**84fiero123** · 03-27-2007, 06:02 AM

Check fuel pump pressure with ignition on, before going to start.

Also if you just turn the ignition to on and wait a few seconds before cranking does it start any better?

If it has weak pressure before start and builds slowly it could be a weak pump.

**TrailLeadr** · 03-27-2007, 08:19 AM

Originally Posted by 84fiero123

If it has weak pressure before start and builds slowly it could be a weak pump.

That's what I was thinking.

**84fiero123** · 03-27-2007, 10:01 AM

Originally Posted by TrailLeadr

That's what I was thinking.

After reading my own post I should have added that if the pressure is good, then it could possibly be the ignition module.

Ignition modules do some funny things, at least I have seen them work and then not, or not work at all and then after spraying starting fluid in it would run until shut down, and then not run again until I sprayed more starting fluid.