jtm087

Today when I get in my car and stop with car in drive the engine rumbles and is sluggish on taking off. NO codes, no check engin lights. My only idea would be that yesterday my gas was on "E" and I start to put gas in when I realized it was 87 octane!!! but I realized it soon after I statrted pumping(1 gallon tops) and then I began to put the normal 93 octane in it (4 gallons). Yesterday and for the most part of today it drove fine, but about an hour ago I start it up and drive alittle bit and I feel the engine shaking whil driving slow or stopped. In neutral I notice it a little bit. So I go and fill the tank up with 93 octane and put some gas treatment in it....12 miles later still noticing shaking.. ANY IDEAS???

PAREDLINE

Motor mounts

jtm087

how can I check to see if this is for sure

killcrap

iTrader: (3)

park, and pull up parking brake, drop it in to drive, and push gas pedal and notice how much the engine moves. then do it in reverse. and compare the two readings.

konak85

iTrader: (10)

and... then what?

jtm087

If i drop it in drive/reverse and push the gas the car will move, and yeah what next???

Black Maxima

Wheel chucks/blocks and make use of a steep driveway.

jtm087

ok and then what??????????

jtm087

and what eles could it be other than motor mounts?? could it have something to do with the 87 octane gas I put it. It is a weird feeling like when you are about to stall out in a manual, but I have an auto and it does it for like 2 sec and stops for like 5 secs and does it again???? WTF

PAREDLINE

people use 87 octane gasoline all the time and it doesn't do anything except create a rotten egg smell with heavy acceleration.

Is your Check Engine light on?

illmortal

Yeh I believe it's the motor mounts, if you put it in Drive and accelerate and the engine block moves roughly, then you need to replace a mount.. or maybe all of them. If the reverse moves just as bad then I'd recommend getting your mounts checked out.

tedo007

iTrader: (6)

mine vibrates when i hit gas slowly. right about when i hit the 900 or 1000 rpm line. any reason?? after that its smooth

jtm087

wow how much is motor mounts to replace??? how hard a job is it to do?? how much would a mechanic charge?? I removed my right side motor mount to replace my water pump, it wasn't too bad, how about the rest???

jtm087

how long can I let this go on til I have a real problem???

PAREDLINE

You can wait as long as you want. Eventually, if your mounts are bad, the bracket surrounding the mounts will crack and the bolts that go into the motor or the chassis may snap.

Right now you might have a little play in the mount. There's no tried and true way to test them without jacking up the car and looking at them. Then trying to move the motor with a big pry bar. You can try moving the engine by putting it in drive and reverese with the brakes on and seeing if the engine "rocks". It should rock a little but not a lot. But how will you know which is which.

Best bet is to take it to a shop and get it looked at by someone who knows what to look for.

PAREDLINE

To answer your earlier question, it is not very difficult. You will need a large "professional-type" floor jack and some heavy duty jack stands or ramps. Don't buy those stupid plastic ramps but buy the metal ones that have at least 3 points where they contact the ground.

The object is to put the car up on ramps and jack up under the oil pan (with a piece of wood between the jack and the pan) so the motor is suspended by the JACK and not the motor mounts. Then simply unbolt the mounts or remove the crossmember and change the mount attached.

Any service manual will have detailed instructions as will www.autozone.com's repair guides

jtm087

where is the best/cheapest place to cop some motor mounts?? I figure if I get it checked out and it is a motor mount I wil go ahead and replace them all

BLaKtOut

quick question duno if its on this topic but i go to start my car sometimes and im on a flat surface put the car in drive and usully it should move but it doesnt i have to like actually give it some gas before it goes and then it goes fine and i have no codes and i use 93 octane weather conditions werent bad either was too cold out any input on what this can be if anything

Black Maxima

Check your e-brake cables and stuff. It's probably sticking little bit.

Here's a funny story. When I was driving with my instructor I had to step on the gas to back down my steep driveway. HAHAHA I didn't even have to step on the brake at a stop sign. So all of a sudden the problem stopped but we drove to the gas station to check the tire pressure anyway. HAHAHA It had to be my instuctors bag laying against his brake pedal. HAHAHAHA

PAREDLINE

Make sure you have enough transmission fluid in there