Could bad motor mounts cause stumbling on light acceleration

mike93 · #1 (**permalink**) 10-31-09, 03:11 PM

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?

**Ranger** · #2 (**permalink**) 10-31-09, 09:02 PM

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

mike93 · #3 (**permalink**) 11-01-09, 01:03 AM

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

mike93 · #4 (**permalink**) 11-02-09, 04:20 PM

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!

**Ranger** · #5 (**permalink**) 11-02-09, 04:27 PM

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

mike93 · #6 (**permalink**) 11-02-09, 04:34 PM

So just adjust the ignition timing?

Dave S Texas · #7 (**permalink**) 11-02-09, 05:35 PM

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.

mike93 · #8 (**permalink**) 11-02-09, 05:44 PM

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

**Ranger** · #9 (**permalink**) 11-02-09, 10:44 PM

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

mike93 · #10 (**permalink**) 11-02-09, 11:03 PM

ok i really hope that does it

90BeigeElDorado · #11 (**permalink**) 11-03-09, 12:41 AM

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.

hcaddy95 · #12 (**permalink**) 11-03-09, 01:59 AM

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

mike93 · #13 (**permalink**) 11-03-09, 11:40 AM

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?

Dave S Texas · #14 (**permalink**) 11-03-09, 07:06 PM

"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.

mike93 · #15 (**permalink**) 11-06-09, 10:12 PM

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