: Valves...4100



GeneLaw1
12-22-09, 01:52 PM
Hello,

I have been having a problem on my Deville with a rough idle from time to time, and skipping during driving. I take it this place that specializes in Cadillacs and they claim "the valves are sticking and you need a $2000 valve job"......Anyone have any input on this?? The engine is the HT 4100 and has 52k miles on it, it was driven off and on and when I took possession of it, I noticed the rough idling a couple years ago. It seems to accelerate fine if thats any help.

Gene

jayoldschool
12-22-09, 02:27 PM
lol, for 2 grand, you can buy another car! Be happy the 4100 runs. My mother's 84 4100 idles a bit rough as well, but drives fine. If you want to try and get it running smoother, do the standard tune up stuff. Check for codes, too (see the tech sticky) to see if there is something that is wrong. Plugs, wires, cap, rotor, PCV, air cleaner, fuel filter. I would have the car done with the Motorvac service. This will clean the intake, injectors, valves, combustion chambers, and the cat. Make sure you use the coolant tabs in the cooling system. Also, the 4100 calls for high octane gas. Don't run it on 87.

GeneLaw1
12-22-09, 02:31 PM
lol, for 2 grand, you can buy another car! Be happy the 4100 runs. My mother's 84 4100 idles a bit rough as well, but drives fine. If you want to try and get it running smoother, do the standard tune up stuff. Check for codes, too (see the tech sticky) to see if there is something that is wrong. Plugs, wires, cap, rotor, PCV, air cleaner, fuel filter. I would have the car done with the Motorvac service. This will clean the intake, injectors, valves, combustion chambers, and the cat. Make sure you use the coolant tabs in the cooling system. Also, the 4100 calls for high octane gas. Don't run it on 87.

Thanks Jay, I actually forgot to mention, I have done the FULL tune-up, except for the Fuel filter, which I cannot seem to find anywhere. I even went to the dealer and the one I gave me is different than the one thats on the car. Where could I get this motorvac service done? Also, Thanks to this site, I did drop the coolant tabs in there, and I ALWAYS run 93 in it....

jayoldschool
12-22-09, 02:41 PM
Fuel filter should be on the frame rail in front of the rear tire.

To free sticking valves/lifters: add a pint of transmission fluid a few days before an oil change. Trans fluid is just oil with lots of friction modifiers and cleaners.

Here are the FL locations that have been well reviewed (if it has two ** it has been recommended) on the SS Forum for Motorvac:

FL Fern Park Ice Cold Auto Air 407-834-1065 http://www.icecoldauto.com
FL** Orlando AutoWerks Haus 407-648-4848 via UWSACF
FL** Haines City Snyder Tire 863-422-4611 Via uwsacf
FL** Orlando Royal Volkswagen 407-644-2222 Via uwsacf
FL** Longwood Automotive One (407) 699-9111 www.automotiveone.com via uwsacf
FL** Longwood Ultimate Motor Works (407) 339-3443 Lamborghini dealer
FL No. Lauderdale ASE Car Care 954-720-9883 http://www.asecarcare.com

These are reviews on Motorvac:
Unbiased writeup http://www.theautochannel.com/mania/.../motorvac.html

naisso page http://www.impalaclub.com/naisso/for...TOPIC_ID=19155

ford forum thread http://www.ford-trucks.com/forums/showthread.php?t=4455

Ed Wright and MotorVac too – GM High Perf http://www.gmhightechperformance.com/tech/0403htp_chip/

Pat Goss of MotorWeek garage: http://www.patgosscarworld.com/modul...d=0&page_id=30

GeneLaw1
12-23-09, 11:09 AM
Thanks a lot Jay, I am actually in Atlanta for the holidays right now, might you be ablel to lead me to any spots in Metro Atlanta that does the service. I am getting ready to start calling around myself here...

jayoldschool
12-23-09, 01:59 PM
Here's the GA listings:


GA** Sugarloaf Midtown Tire [Goodyear] 770-339-3190
atlss96@bellsouth.net
GA Newnan Manning + Son 770-251-5199 http://www.manningandson.com/services.htm
GA Powder Springs Powder Springs Petroleum 770-943-4961

82CDV
12-23-09, 02:59 PM
Fuel filter should be on the frame rail in front of the rear tire.

To free sticking valves/lifters: add a pint of transmission fluid a few days before an oil change. Trans fluid is just oil with lots of friction modifiers and cleaners.

Here are the FL locations that have been well reviewed (if it has two ** it has been recommended) on the SS Forum for Motorvac:


These are reviews on Motorvac:
Unbiased writeup http://www.theautochannel.com/mania/.../motorvac.html

naisso page http://www.impalaclub.com/naisso/for...TOPIC_ID=19155

ford forum thread http://www.ford-trucks.com/forums/showthread.php?t=4455

Ed Wright and MotorVac too GM High Perf http://www.gmhightechperformance.com/tech/0403htp_chip/

Pat Goss of MotorWeek garage: http://www.patgosscarworld.com/modul...d=0&page_id=30

Jay, where does your mom take her car to be serviced? I am looking for a good shop near Fort Lauderdale that is reasonable.

jayoldschool
12-23-09, 03:51 PM
I usually do whatever it needs when I visit. It hasn't needed anything big, so I think she has just been to Firestone for a set of tires and an oil change. I'll ask her...

82CDV
12-23-09, 04:22 PM
Thanks. I saw this in your previous post so was wondering.

FL No. Lauderdale ASE Car Care 954-720-9883 http://www.asecarcare.com

jayoldschool
12-23-09, 05:42 PM
That does sound familiar now...