4.8 hard to start

[stef8]

My 1999 4.8 is getting harder to start since a couple of weeks. There is no problem starting when cold or very hot, but when I try to crank it up after 5, 10 or 30 minutes, it's taking a while to do so, maybe 6 to 8 seconds, and then it's runing rough also for a few secs.

 

 

From what I've been reading in the Helm manual, this could be caused by the MAF, the ECT or the IAT.

 

 

If I have a dirty MAF sensor, I'm wondering if it could be cleaned and what is the procedure to do so. Any ideas would be welcome.

 

 

Thanks

Stef

[marman]

I had a very similar problem. It was the fuel pressure regulator. To see if yours is bad, pull off the vacuum hose. If fuel is present, replace the regulator. Good Luck!

[stef8]

Thanks Marman for the info, but should I pull that hose when the engine is runing or when it's off.

 

Thanks

Stef

[marman]

Pull the vacuum line from the regulator with the engine off.

[ness5575]

i had the same problem with my truck. tried the fuel pressure regulator, but that didnt work. I needed a new fuel pump.

[stef8]

This afternoon I pulled the vacuum hose connecting to the fuel pressure regulator

and fuel was leaking a lot from the the tube, guess that was the problem so I ordered a new regulator, going to get it tommorow.

 

Thanks again Marman!

 

Stef