[GOIA]

I have a 98 Olds Intrigue with Series II 3800. When I start it up, I feel a pronounced movement from the engine... like a bounce or jump. This happens ONLY while cranking and stops once the starter disengages. When engine is running everything seems ok. I replaced the 2 upper mounts with the ZZP poly mounts. That helped some but the engine still tries to "jump" while cranking... the movement is less but the feel is harsher now. Just does not seem right. I have never had any car do this before.

Do you guys think it could be the lower mounts?

Thanks,

Steve

 

[BIG JEFF]

These lower mounts are prone to failure. The hydraulic pockets in them collpase and allow excessive movement,
and vibration.


BIG JEFF

 

[4rsssfed_grandprix98]

Do you think it is possible that these mounts would cause a popping sound during initial acceleration. I sometimes hear a popping sound when I first start to accelerate, but I believe it is directly linked to the load I put on it during acceleration. If I accelerate easily, it will usually not pop at all, but the minute I move past 1/4 pedal there is one small pop, usually only will happen in 1st gear too, If I let it get to second then give it half the pedal no pop. Do you think these could be causing my mysterious noise???

 

[GOIA]

Here's the conclusion I've come to... since I am still getting engine movement after replacing the upper mounts, I'm going to replace the lower mounts just to eliminate that possibility. I don;t know what else it could be, especially since the lowers are known to go bad. A local shop quoted me $435 parts & labor. I can get parts online for about $165 and do the work myself (I think). Down side is it sounds like a labor intensive job.

Steve
98 Intrigue

 

[Merc]

Steve see my post about changing them out before you go and have the dealer do it.

http://www.3800tech.com/forum/showthread.php?t=923

Its not an easy job but its not that hard either. You need to have the right tools and some time to do it.

 

[GOIA]

I read your write up on changing the lower mounts. Doesn't sound too bad but jacking the engine up sounds like it could be a bit hairy. I see you used NAPA mounts... is there a difference between them and GM parts? I'd rather use the best ones cuz I'm only gonna do this job once!

 

[Merc]

Napa mounts are basicly a GM replacement. They make a direct replacment and they also make a firmer solid mount. Those are the ones I got. You will get more vibration from them but they are SOLID!

 

[hotrodprix]

what is the part number on those firm mounts?

 

[GOIA]

Sold Rubber Motor Mount..... 6121730 $39.99
Solid Rubber Tranny Mount... 6221242 $28.49

per NAPAonline.com

 

[mcshocks]

Napa mounts are basicly a GM replacement. They make a direct replacment and they also make a firmer solid mount. Those are the ones I got. You will get more vibration from them but they are SOLID!

Hey Merc,

So which mounts did you go with? The solid or the hydraulic from napa, because in your other thread you posted.

I replaced my mounts with the ones NAPA sells. They are the hydrolic mounts. Very solid!

Just curious because I was going to replace mine here with my engine swap. Oh yeah ignore your spelling error .

 

[n4cer]

Hey Merc,

So which mounts did you go with? The solid or the hydraulic from napa, because in your other thread you posted.

hydraulic from napa

 

[GOIA]

Can't speak for Merc, but I went w/solid rubber NAPA mounts. I hate doing jobs twice and I figured if hydraulic mount failed once it would fail again. I did not notice any increased vibration with the solid rubber mount.

Hey I went to your web page... where did you get that aluminum upper intake?
Never seen one before.

Steve

 

[mcshocks]

Can't speak for Merc, but I went w/solid rubber NAPA mounts. I hate doing jobs twice and I figured if hydraulic mount failed once it would fail again. I did not notice any increased vibration with the solid rubber mount.

Hey I went to your web page... where did you get that aluminum upper intake?
Never seen one before.

Steve

That is the L26 upper intake from the new NA 3800 in the 04 gpgt's.

Thanks for the info guys.

 

[NismoMaxima]

if your going to take them out yourself why not make them polyurathane? that will definitly get rid of your engine movement...

 

[Merc]

No one makes a poly mount for our cars yet.