Hi everyone it's me again just wondering could bad motor mounts cause my stumbling on light acceleration i checked the motor mounts today and when in drive and under load the motor was jumping around not so bad in reverse could that be the problem or no i don't wana keep putting money into the car that isn't gonna solve the problem do you think it can be that?

"stumbling" is usually a misfire. No way will a bad motor mount cause that.

oh ok well im gonna replace the motor mounts anyway because the motor is jumping around and don't like to neglect my baby then worry about the stumbling and the stumble is vvery light now at as bad after i just changed the distributor cap and rotor like a month ago

Could it be that my ignition is timing or off the car is also pinging and all i put in the car is 93 super premium!

Yes, if you are using 93 and are still pinging then you have a timing problem.

So just adjust the ignition timing?

Mike, did you buy an FSM for the DeVille? Read/follow the procedure for setting the initial timing. Once the initial timing is set correctly, the computer takes care of timing.

Should adjusting the timing do the job and fix the stumbling??

If it is off and is what is causing it, then yes.

ok i really hope that does it

Mike, buy an FSM. Then follow the diagnostic trouble tree for light stumble on acceleration. We all know you have been throwing parts at the car for some time. If you are doing all of this work yourself, HELP yourself with a FSM. If you are paying someone to do all of this work for you, then find another tech to do it. The one you are using is ripping you a new one. Once you get the off idle stumble figured out(or at least you think you have by installing a new pcm and motor mounts. Man, my caddy idles so smooth now!) let us know about how clean your transmission fluid is. Then tell us how you hope it will last another 800K miles if you maintain it.:rolleyes::nono:

I think its your flux compasiter causing your misfire problem mike.

ok so i should put a new pcm and motor mounts? And the transmission fluid is very clean i had the trans rebuilt to months ago. how long do you think the car will last if i really maintain it?

"ok ill buy one because i do do a lot of my own work" (Oct 25 Pick Up Coil ??)

Above is your answer to the advice of buying an FSM for your DIY work.
I asked you Monday if you did buy one, and received no answer.

Im sorry ive been really busy and no i havent got the chance to buy one yet still financing trans so my money is tight when i get extra money i will buy one

Update on the stumbling me and my friend adjusted the ignition timing it was at 26 degrees i now put it at the normal ignition timing 10 degrees now the car just really lacks power car runs better i know it is that but why is it at normal ignition timing speed and the car lacks power?

It would not run (well it might idle) at 26 degrees. It sounds like you guys did the timing w/o jumping the ALDL connector. Or maybe you used one of those timing lights that has the advance/retard settings? Something definitely aint right here.

Idk all i know is it's where it should be now at 10 degrees and the car has now power at all idles fine runs fine just no power idk please help

Mike, the question remains. Did you jump the aldl connector under the dash when you set the timing? If you did not then the timing will not be correct. You MUST jump the A and B terminals or you will never get the timing right. GET AN FSM, then try again. If you keep monkeying with it without knowing what you are doing you are liable to screw up your engine. But heh, what do we know? :alchi:

Mike, it almost sounds like you are not the one doing the work on the car... I can't see how the base timing could have been at 26 degrees and the car still be driveable. The timing has to be checked with the A and B terminals jumpered AND the engine running at operating temp in park at LESS THAN 800 rpms. Also if the timing light has advance/retard, it MUST be set to zero before beginning.

You have to help us to help you... Since no one here can physically look at the car, any help you get is only as good as how well you can describe whats going on. This stuff isn't supposed to be easy... That's why mechanics make the big bucks.

no i havent been doing most of the work and no we didn't jump the connector and my friend had a timing light with the advance/retard timing setting im gonna try it again

If you set the timing without jumping that connector, you just made it worse. Someone correct me if I am wrong as it's been a long time since I've seen a 4.9, but isn't there a green plug on the distributor that has to be unplugged when doing the timing? Maybe that was the 4.1.

If you set the timing without jumping that connector, you just made it worse. Someone correct me if I am wrong as it's been a long time since I've seen a 4.9, but isn't there a green plug on the distributor that has to be unplugged when doing the timing? Maybe that was the 4.1.

No green plug, just the ALDL, then the dash will display "SET TIMING MODE".

Ok im gonna fix that and get it right tomorrow and fix my baby right now!

First, I would not let your friend/mechanic touch the car again. There are basic things one must know before attempting to do diy repairs. If he did not know to jumper the connector, then he does not need to be messing with your car. I know that many on here have said this, but I will say it one last time. GET A FSM BEFORE YOU DO REAL DAMAGE TO THE CAR, ENGINE, ETC. I have no problem with someone with little knowledge wanting to work on their cars themselves. That's how one learns. However, blindly going at a Cadillac with relatively sophisticated electronics without a guide or proper knowledge is like :thepan:.

ok will do thanks

First, I would not let your friend/mechanic touch the car again. There are basic things one must know before attempting to do diy repairs. If he did not know to jumper the connector, then he does not need to be messing with your car. I know that many on here have said this, but I will say it one last time. GET A FSM BEFORE YOU DO REAL DAMAGE TO THE CAR, ENGINE, ETC. I have no problem with someone with little knowledge wanting to work on their cars themselves. That's how one learns. However, blindly going at a Cadillac with relatively sophisticated electronics without a guide or proper knowledge is like :thepan:.

:yeah:

Here's some trivia for ya: How could your friend know the timing was at 26 degrees if the indicator only goes up to 22?:p

idk haha thought it went up to 30

No green plug, just the ALDL, then the dash will display "SET TIMING MODE".

Thanks, I must have been thinking of the 4100. It's been so long that they all seem to blend together.

Readjusted the ignition timing car runs like a champ now changing the autolites that i have in there now with ac delcos