2001 Saturn SC1 Car lurches when put in drive, reverse, at

Tiny
KINGFAMILY
  • MEMBER
  • 2001 SATURN SC1
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 132,000 MILES
The vehicle lurches/jumps when put in reverse, drive, and at around 10 mph and at 30 mph. I have replaced both the top right motor mount and the trans-axle motor mount on the lower left. The bolt holding the bottom right mount had worked nearly all the way out. All of the mounts have been either replaced or checked.

The lurching is controlled now due to the new mounts absorbing a lot of the shock, but there is still a noticeable lurch.

What am I missing here? The local mechanic said it was one motor mount, but obliviously it was more than that.

Any help would be greatly appreciated.
Saturday, October 23rd, 2010 AT 12:26 PM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
First of all thank you so much for your donation. So when you put the shifter in reverse it shift's hard into reverse?Is there a delay going into reverse?Or does it just shift hard into reverse?It also shift's hard when putting it into drive?So it shift's hard when shifting gear's also?Do you have any code's?So all your mount's are good and tight now?The more detail's the better.
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Saturday, October 23rd, 2010 AT 12:35 PM
Tiny
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There doesn't appear to be any delay when it shifts. It shifts hard into reverse and drive. It's an automatic, but yes, it shifts hard at about 10 and 30, There are no lights on, but I haven't had that checked yet. All of the mounts are tight after replacing the two broken ones. The engine doesn't lurch as much now, but there's still a noticeable issue.
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Saturday, October 23rd, 2010 AT 1:14 PM
Tiny
SATURNTECH9
  • MECHANIC
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Alright go to a auto part's store like auto zone and have it scanned for code's and let me know what code's you come up with. So far it sound's like your transmission pressure is too high.
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Saturday, October 23rd, 2010 AT 1:47 PM
Tiny
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  • MEMBER
  • 5 POSTS
No help with the auto parts store (Advance Auto Parts). They checked the codes and only came back with a misfire on cylinder one and a code for the evaporator. Neither of those would be causing these issues (I don't think). It's not my car and I usually don't drive it, but on the way to the store I noticed that the RPMs would jump up quite a bit when the engine jumped. It also seems to do it at about 45 mph as well. It jumps at all of the speeds both accelerating and decelerating.
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Saturday, October 23rd, 2010 AT 2:17 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Alright next step is to check the fluid pressure in the transmission. You will need to get a transmission pressure gauge set and let me know when you get it and I will give you instruction's on how to test the pressure's. It's going to get a lot harder from here on out. After we check the pressure's were probably going to be removing the valve body and air checking the clutches with compressed air.
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Saturday, October 23rd, 2010 AT 3:18 PM
Tiny
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Haven't had a chance to check the pressure, but I found that the fluid level was slightly high. I drained some fluid so that it's now at the proper level. The fluid looked good and didn't smell burnt. It still kicks pretty good in reverse, but not near as bad in drive and at speeds.

I don't know if it makes a difference or not, but I took it for a test drive and manually shifted it. If I shift from 3rd to 2nd at about 20 mph and then up to drive at about 35 mph there is very little (if any) kick shifting up or down. Would that indicate more of a clutch problem?

Thanks so much for you help.
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Sunday, October 24th, 2010 AT 6:48 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Doesn't sound like a clutch issue clutch issue's don't cause hard shift's especially when your at a stop and first putting in reverse or drive. Sound's like a pressure issue.
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Monday, October 25th, 2010 AT 12:37 AM

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