1997 Wont Start when hot

Biggsw784 · Jun 3, 2013

I have a 97 f350 and when cold it has a extended crank before starting but will start. once hot and you kill it, it will not restart. It has actually died going down the road also. I have changed the mechnical fuel pump by the fuel filter housing and also changed the cam sensor with no improvements. My scanner wont connect to the icp or ipr to watch oil pressures. What else can I check for?? Thanks

ghohouston · Jun 3, 2013

Ipr o rings or injector o rings most likely, have you ever had the injectors or ipr out? Mileage?

Biggsw784 · Jun 3, 2013

no sir i have not. it has 175000 on it.

ghohouston · Jun 3, 2013

I would re ring all the injectors, take the ipr apart and clean it well with solvent or brake clean, and install new o rings on it too. There is a good write up for cleaning the ipr/taking apart somewhere, just search around for it

Justin@DP-Tuner · Jun 3, 2013

I would suspect the IPR as well. Try cleaning or replacing it. Even if you monitor it, the only thing you will see is duty cycle which does not monitor the actual position of the valve, only the demanded position.

YJSONLY · Jun 3, 2013

My ipr was bad and had the same issue you are having. But mine did not shut off on me tho. But not starting it did for about 4 days and it went to the shop.

ActionRick · Jun 3, 2013

Justin@DP-Tuner said:
I would suspect the IPR as well. Try cleaning or replacing it. Even if you monitor it, the only thing you will see is duty cycle which does not monitor the actual position of the valve, only the demanded position.

Never heard of anyone having long term success cleaning an IPR . They usually stick from wear ...

ghohouston · Jun 3, 2013

Well in my case, the screw that takes the large flathead, had backed off part of a turn and wasnt tight, and it never hurts to get any debris out that may be in it. Cleaned my idle up too, before it would "hunt" a bit

Justin@DP-Tuner · Jun 4, 2013

ActionRick said:
Never heard of anyone having long term success cleaning an IPR . They usually stick from wear ...

True. But it can be a temporary fix to help diagnose the issue.

ActionRick · Jun 4, 2013

Justin@DP-Tuner said:
True. But it can be a temporary fix to help diagnose the issue.

Ever heard of the edge filter ?

ActionRick · Jun 4, 2013

ghohouston said:
Well in my case, the screw that takes the large flathead, had backed off part of a turn and wasnt tight, and it never hurts to get any debris out that may be in it. Cleaned my idle up too, before it would "hunt" a bit

So , what does the screw have to do with cleaning ?What does cleaning have to do with temp ?...