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Registered
2002 STS
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370 Posts
Discussion Starter #1
hello, all, i am new to these forums, so howdy-do everyone?
ok, i have a 99 SLS with 115,500 mi on it, which was previously driven by my aunt. hence, it has been well taken care of- mechanically speaking.
however, i have had this car for about a month now, and no problems until a couple of days ago. When the car sits (shut off) for more than...say... 10- 15 mins it has lots of difficulty starting back up. I put the key in, turn the key to start, just like yer supposed to (in most cars anyway...) but the damn thing takes about 7-10 seconds to start. the starter is turning the whole time, but it finally turns over after 7-10 seconds. even when it finally turns over it takes about 3-4 turns to start the engine. also, when i am idling at a light or sign my rpm gauge like to sway. usually anywhere from 600-1100 rpms. not to mention, i had the car running in park today, ran into a gas station, came out, and the car had quit...
any ideas anyone? fuel pump, fuel filter, fuel? or is it something more internal, like little lube in the cylinders?
my friend who was with in the car all day witnessed all this and said that similar things had happened to his 97 Aurora right before his tranny went out.
HELP! i don't want my tranny to go out!
 

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99 STS
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700 Posts
It sounds like a fuel pressure leakdown problem, The faulty componet could be one of the following: a fuel pressure regulator, a fuel pump, or a fuel injector that is leaking into a cylinder while the engine is turned off. A fuel pressure gauge would be helpful in diagnosing a nd pin pointing the problem. A quick check that you can do is pull the vacuum line off of the fuel pressure regulator and see if there is raw fuel in it, if it does the regulator is your problem. Your Trans has nothing to do with the systoms you mention.

Good Luck
 

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Registered
2002 STS
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370 Posts
Discussion Starter #3
and, where would i find the fuel pump, and fuel pressure regulator? also, fuel pressure gauge would be applied where?
 

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Cadillac Owners Connoisseur
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1,164 Posts
samm said:
hello, all, i am new to these forums, so howdy-do everyone?
ok, i have a 99 SLS with 115,500 mi on it, which was previously driven by my aunt. hence, it has been well taken care of- mechanically speaking.
however, i have had this car for about a month now, and no problems until a couple of days ago. When the car sits (shut off) for more than...say... 10- 15 mins it has lots of difficulty starting back up. I put the key in, turn the key to start, just like yer supposed to (in most cars anyway...) but the damn thing takes about 7-10 seconds to start. the starter is turning the whole time, but it finally turns over after 7-10 seconds. even when it finally turns over it takes about 3-4 turns to start the engine. also, when i am idling at a light or sign my rpm gauge like to sway. usually anywhere from 600-1100 rpms. not to mention, i had the car running in park today, ran into a gas station, came out, and the car had quit...
any ideas anyone? fuel pump, fuel filter, fuel? or is it something more internal, like little lube in the cylinders?
my friend who was with in the car all day witnessed all this and said that similar things had happened to his 97 Aurora right before his tranny went out.
HELP! i don't want my tranny to go out!

Welcome to the forums, Samm. I would post this question in the Northstar forum if I was you, just for more opinions. Here's what I think:

There are two problems. One is the restart problem. That is almost certainly a leaking fuel pressure regulator. If you take off the appearance cover on top of the engine, you will see the fuel rail that connects to all the injectors. There is a small canister at one end of the rail and it has a vacuum line connected to it. Start the car and pull the vacuum line off the regulator. My guess is you will see fuel leaking from the vacuum nipple of the regulator. A new fuel pressure regulator is about $50 and you can install it yourself in about 5 minutes or less. Very simple job.

As for the idle speed problem, that sounds like the Idle Air Control valve. If you go to the Northstar forum and look at the first post in there "Got Codes? Look here!" you will see how to check for diagnostic codes in the computer. Go through that process and post in the Northstar forum what codes you have. Chances are, one of them is for the idle air control valve. It is also relatively inexpensive and can be installed very easily in very little time with a few basic tools.

Check those items and come back to let us know what you find. Someone will be able to get your car back to normal with a minimum of effort and expense...

Good luck!
 

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Registered
2002 STS
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370 Posts
Discussion Starter #6
great news guys... just got a new FPR and installed it today. starts and idles fine.
Thanks everyone!
 

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2000 Dev, 94 FW (crushed), 96 FW Limo (sold), 95 SLS (sold)
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367 Posts
Thanks for posting your results. It is all too common that people are w\so happy their problem is solved that they don't bother to let everyone learn by their experience. Once again, Thanks!!
 
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