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#2463 of 2506 Re: Problem starting 1997 DeVille in morning [railer] by bolivar Apr 26, 2008 (1:42 am)
Replying to: railer (Apr 25, 2008 6:07 am) It could be a leaking Fuel Pressure Regulator (FPR).   Are you somewhat 'handy' around the motor? It's pretty easy to check for a leak. The FPR is about $60, and can be replaced easily also.
#2464 of 2506 98 Deville Northstar octane additive by pagar May 08, 2008 (11:39 am)
This is first time I'm on this forum. I inherited 98 deville northstar with 45,000 miles. Gas is killing me...17 mpg ave. What about regular gas and octane additive? I don't want to ruin the car. Like new. Should I even attempt it or just be safe and use high test??? Replies to this message: bremertong (Jun 03, 2008 9:46 pm) bremertong (Jun 03, 2008 9:51 pm) bolivar (Jun 03, 2008 11:03 pm)
#2465 of 2506 Re: 98 Deville Northstar octane additive [pagar] by bremertong Jun 03, 2008 (9:46 pm)
Replying to: pagar (May 08, 2008 11:39 am) I also owned a 1998 Deville from 2001 to 2004. My 98 Deville got an average of about 20 MPG in the city and 27 on the highway. Think your car may need some fine tuning. If you have a dealership you trust take the car in for your next oil change and bring this up to the service department, suspect they can put the car on computer diagnostic system and find out why your fuel economy is below average for your car.
#2466 of 2506 Re: 98 Deville Northstar octane additive [pagar] by bremertong Jun 03, 2008 (9:51 pm)
Replying to: pagar (May 08, 2008 11:39 am) Forgot to mention that i have used STP fuel injector cleaner fluid on my 1998 Deville. Never had any problems with the Northstar system using this product but can't say for sure that it helped. The cost is around 90 cents per container. The folks at STP claim that it helps fuel economy and keeps fuel injectors clean.
#2467 of 2506 Re: 98 Deville Northstar octane additive [pagar] by bolivar Jun 03, 2008 (11:03 pm)
Replying to: pagar (May 08, 2008 11:39 am) A lot depends on how agressive you drive, or the conditions you drive. If you have an easy foot on the gas, I think you can drop to mid-grade without any problems. You could probably drop to regular, and will hear some pinging, but still have no problems.   But, it you accelerate quickly, or drive in mountainous roads, you may need to keep premium gas in to. When the motor is under heavy load is when premium is needed to eliminate pinging.   I think if you drop the grade, your milage will probably also drop.   And I agree, the 20mph should be what you can get with a mix of in-town and highway driving, and with constant highway driving, you should be able to get 25mgp or better. On premium.
#2468 of 2506 How to disable airbags - 1998 Cadillac Sedan deVille D'Elegance by efugate Jun 28, 2008 (6:03 pm)
How do you disable side impact airbags in a 1998 Cadillac Sedan deVille D'Elegance safely? We had a collison in which the driver's door was damaged and we are currently attempting to change the driver's door?
#2469 of 2506 Additives to fuel stystem by onelord Jun 30, 2008 (8:28 pm)
I have a 03 deville with 66000 miles on it. Im getting 21mpg on the highway and 19 in the city. I was wondering if I should add something to the fuel in hopes of cleaning the fuel injectors. Is this wise to do? Replies to this message: bremertong (Jun 30, 2008 10:19 pm) bolivar (Jul 01, 2008 11:10 pm)
#2470 of 2506 Re: Additives to fuel stystem [onelord] by bremertong Jun 30, 2008 (10:19 pm)
Replying to: onelord (Jun 30, 2008 8:28 pm) I owned a 1998 Deville and later a 2004 Deville for three years each and always used STP fuel injector cleaner fluid with each fill up. never had any problems. The 98 got about 27 MPG highway and around 20 in town. The 2004 around 29 MPG highway and 21 city. You may have other issues and may want to try a complete fuel system cleaner (STP has one as do other additive companies). Have you checked your air filter or replaced recently. Your MPG stats sound low so you may want to investigate further if my two suggestions don't improve your MPG performance. The 98 Deville had 39,000 miles on it at time of trade and the 2004 Deville had 36,000 miles on it. Both much lower mile cars than yours but still think you should be getting better results.
#2471 of 2506 Re: Additives to fuel stystem [onelord] by bolivar Jul 01, 2008 (11:10 pm)
Replying to: onelord (Jun 30, 2008 8:28 pm) Unless you have been using very cheap unbranded gasoline, I wouldn't think you have injector problems.   With that milage, i woujld be thinking about plug wires and plugs. Us only GM wires and the recommended plugs. The wires and plugs should be good up to 100,000, but expecially if you have had some mechanical work done near the wires, they could be messed up. If you live in extremely hot area, the wires might also have broked down early.
#2472 of 2506 by onelord Jul 02, 2008 (6:02 am)
I was thinking of using a good brand of injector cleaner. I dont think its the plugss the car runs smooth and has great getup. I think it just needs some injector cleaner. Thanks for the info from both of you. Any info will help all of us. Replies to this message: bremertong (Jul 02, 2008 8:52 pm)

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