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Hard Cold Starts


GreenMachine

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While my car is away getting painted I happened to find out the guy painting my car owns a 97 Deville, he gave us (my father and I) a ride home and I must say having that muffler going really changes the feel of a car... that is number 3 on the list of things to do right now, first is this paint, when it comes back oil change/tire rotation and miscellaneous maintenance, then I go see a muffler guy who comes highly recommended.

Anyway we started talking and he was telling me the car runs just fine, top notch. But in the mornings, its real hard Starting, Cold Starting can take many cranks.

I was thinking FPR? That's usually associated with hard HOT starting though. He's changed the fuel filter, battery is good, could be fuel pump (read that in one of posts that came up in a search). Any ideas? I'm going to have a look in my FSM about this problem and see what I can come up with.

The Green's Machines

1998 Deville - high mileage, keeps on going, custom cat-back exhaust

2003 Seville - stock low mileage goodness!

2004 Grand Prix GTP CompG - Smaller supercharger pulley, Ported Exhaust Manifolds, Dyno tune, etc

1998 Firebird Formula - 408 LQ9 Stroker motor swap and all sorts of go fast stuff

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Thats true, should also say considering a leaky injector.

The Green's Machines

1998 Deville - high mileage, keeps on going, custom cat-back exhaust

2003 Seville - stock low mileage goodness!

2004 Grand Prix GTP CompG - Smaller supercharger pulley, Ported Exhaust Manifolds, Dyno tune, etc

1998 Firebird Formula - 408 LQ9 Stroker motor swap and all sorts of go fast stuff

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Thats true, should also say considering a leaky injector.

If I am not mistaken, a leaky injector would cause black smoke on start up from the rich mixture, you might look for that. Mine is also having hard starting in the morning. As Adallak said, I plan to clean the battery connections.

Does anyone know if the FPR was changed when they changed the fuel rails on recall? I have a new FPR in the shelf, and if the battery terminal cleaning doesn't help, I am thinking of replacing the FPR. I will report my findings over the next couple of days, Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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They didn't change my FPR when they changed my fuel rail. The job was free and the FPR is $66 plus installation (which would be free if the rail was in the technician's hand).

I would think that hard cold starting could be a fuel pump relay problem. If the fuel pump doesn't come on for 10 seconds when the key is turned on, the fuel system will remain unpressurized until cranking speed turns out the oil light.

How about codes?

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As Ranger noted if the FPR is new, I would check fuel pressure cold first thing in the morning, hook up the gage and turn the key on, its possible that your fuel pump relay is deflubiating when its cold and the fuel pump is starting up because of the OIL pressure switch (about 5 to 7 PSI) when its cold. In addition, check your wires and plugs.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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