Jolt when turning on the Blazer

dreamsteve · 11-06-2009, 09:05 AM

Hi,
I have a 2000 2WD Blazer LT with 98,000 miles on it and since I've had it (for a year almost), I've always gotten a jolt through the whole cabin when I cranked the engine/Turned it on.

It happens right at initial ignition and does it about 90 percent of the time. Honestly I notice it more now when it doesn't do it.

Any suggestions as to the cause? It doesn't seem to be hurting anything.

Thanks in advance

S10dude · 11-06-2009, 09:11 AM

as in electrical ? sounds like a bad body ground

dreamsteve · 11-06-2009, 10:16 AM

Not electrical. Sorry. Its like the whole truck jumps a bit..dash, cabin, everything jumps a bit at ignition.

JohnnyDigits · 11-06-2009, 10:19 AM

Motor mounts?

dreamsteve · 11-06-2009, 11:33 AM

Could be. I'm gonna check into it. Had a buddy tell he had the issue and it went away completely after a trans rebuild.

I currently am gearing up to install the Transgo SK 4L60E shift improver kit in the next few weeks. Hopefully that will lessen the issue if it truly is the trans.

What are your thoughts on the chances of it being the transmission?

JohnnyDigits · 11-09-2009, 09:04 AM

Very well could be a tranny issue. With only 98K on the clock, I'm a little sceptical of that though. The 4L60's are a really tough transmissions, I currently have 183K with no rebuilds, just changed fluids, filter and use a Lucas additive for good measure.
I hear that shift kits are bad for transmissions so you may want to do some more research or get some opinions on that part from ones that have used them wether they liked/disliked them. I hear they wear down the tranny though.

S10dude · 11-09-2009, 09:18 AM

Quote: Originally Posted by JohnnyDigits

Motor mounts?

i'll agree w/that !.............

dreamsteve · 11-09-2009, 09:49 AM

Quote: Originally Posted by JohnnyDigits

Very well could be a tranny issue. With only 98K on the clock, I'm a little sceptical of that though. The 4L60's are a really tough transmissions, I currently have 183K with no rebuilds, just changed fluids, filter and use a Lucas additive for good measure.
I hear that shift kits are bad for transmissions so you may want to do some more research or get some opinions on that part from ones that have used them wether they liked/disliked them. I hear they wear down the tranny though.

I certainly agree with your concerns though that kit is not a shift kit as it is a shift improver. It is designed to fix and "improve" the shifting in the 4L60E.

These transmissions had some specific complaints along the years and I only want to rule them out as the cause.

I'll have to check the motor mounts again as I didn't really see the motor move much when I brake-torqued it a few weeks back.

blindbatts · 11-09-2009, 08:31 PM

my blazer does the same thing, it also sometimes lurches forward when it does this, so I think it's the torque converter sticking slightly.

JohnnyDigits · 11-10-2009, 09:35 AM

Quote: Originally Posted by blindbatts

my blazer does the same thing, it also sometimes lurches forward when it does this, so I think it's the torque converter sticking slightly.

That would def be a good place to start.

dreamsteve · 11-10-2009, 09:45 AM

What would be the best way to troubleshoot the torque converter? Wouldn't that require the removal of the tranny?

Again, thanks for the dialog.

11-06-2009, 09:05 AM	#1
dreamsteve Registered User Age: 26 Join Date: Oct 2009 Posts: 18 Location: Houma, LA User is: OffLine	Jolt when turning on the Blazer Hi, I have a 2000 2WD Blazer LT with 98,000 miles on it and since I've had it (for a year almost), I've always gotten a jolt through the whole cabin when I cranked the engine/Turned it on. It happens right at initial ignition and does it about 90 percent of the time. Honestly I notice it more now when it doesn't do it. Any suggestions as to the cause? It doesn't seem to be hurting anything. Thanks in advance
	[Reply w/Quote]

11-06-2009, 09:11 AM	#2
S10dude workin it ! Join Date: May 2006 Posts: 11,022 Location: Sacramento,Ca. User is: OffLine	Re: Jolt when turning on the Blazer as in electrical ? sounds like a bad body ground
	[Reply w/Quote]

11-06-2009, 10:16 AM	#3
dreamsteve Registered User Age: 26 Join Date: Oct 2009 Posts: 18 Location: Houma, LA User is: OffLine	Re: Jolt when turning on the Blazer Not electrical. Sorry. Its like the whole truck jumps a bit..dash, cabin, everything jumps a bit at ignition.
	[Reply w/Quote]

11-06-2009, 10:19 AM	#4
JohnnyDigits Low Class Age: 29 Join Date: Aug 2009 Posts: 217 Location: NC User is: OffLine	Re: Jolt when turning on the Blazer Motor mounts?
	[Reply w/Quote]

11-06-2009, 11:33 AM	#5
dreamsteve Registered User Age: 26 Join Date: Oct 2009 Posts: 18 Location: Houma, LA User is: OffLine	Re: Jolt when turning on the Blazer Could be. I'm gonna check into it. Had a buddy tell he had the issue and it went away completely after a trans rebuild. I currently am gearing up to install the Transgo SK 4L60E shift improver kit in the next few weeks. Hopefully that will lessen the issue if it truly is the trans. What are your thoughts on the chances of it being the transmission?
	[Reply w/Quote]

11-09-2009, 09:04 AM	#6
JohnnyDigits Low Class Age: 29 Join Date: Aug 2009 Posts: 217 Location: NC User is: OffLine	Re: Jolt when turning on the Blazer Very well could be a tranny issue. With only 98K on the clock, I'm a little sceptical of that though. The 4L60's are a really tough transmissions, I currently have 183K with no rebuilds, just changed fluids, filter and use a Lucas additive for good measure. I hear that shift kits are bad for transmissions so you may want to do some more research or get some opinions on that part from ones that have used them wether they liked/disliked them. I hear they wear down the tranny though.
	[Reply w/Quote]

11-09-2009, 09:18 AM	#7
S10dude workin it ! Join Date: May 2006 Posts: 11,022 Location: Sacramento,Ca. User is: OffLine	Re: Jolt when turning on the Blazer Quote: Originally Posted by JohnnyDigits Motor mounts? i'll agree w/that !.............
	[Reply w/Quote]

11-09-2009, 09:49 AM	#8
dreamsteve Registered User Age: 26 Join Date: Oct 2009 Posts: 18 Location: Houma, LA User is: OffLine	Re: Jolt when turning on the Blazer Quote: Originally Posted by JohnnyDigits Very well could be a tranny issue. With only 98K on the clock, I'm a little sceptical of that though. The 4L60's are a really tough transmissions, I currently have 183K with no rebuilds, just changed fluids, filter and use a Lucas additive for good measure. I hear that shift kits are bad for transmissions so you may want to do some more research or get some opinions on that part from ones that have used them wether they liked/disliked them. I hear they wear down the tranny though. I certainly agree with your concerns though that kit is not a shift kit as it is a shift improver. It is designed to fix and "improve" the shifting in the 4L60E. These transmissions had some specific complaints along the years and I only want to rule them out as the cause. I'll have to check the motor mounts again as I didn't really see the motor move much when I brake-torqued it a few weeks back.
	[Reply w/Quote]

11-09-2009, 08:31 PM	#9
blindbatts Registered User Age: 27 Join Date: May 2007 Posts: 32 Location: User is: OffLine	Re: Jolt when turning on the Blazer my blazer does the same thing, it also sometimes lurches forward when it does this, so I think it's the torque converter sticking slightly.
	[Reply w/Quote]

11-10-2009, 09:35 AM	#10
JohnnyDigits Low Class Age: 29 Join Date: Aug 2009 Posts: 217 Location: NC User is: OffLine	Re: Jolt when turning on the Blazer Quote: Originally Posted by blindbatts my blazer does the same thing, it also sometimes lurches forward when it does this, so I think it's the torque converter sticking slightly. That would def be a good place to start.
	[Reply w/Quote]

11-10-2009, 09:45 AM	#11
dreamsteve Registered User Age: 26 Join Date: Oct 2009 Posts: 18 Location: Houma, LA User is: OffLine	Re: Jolt when turning on the Blazer What would be the best way to troubleshoot the torque converter? Wouldn't that require the removal of the tranny? Again, thanks for the dialog.
	[Reply w/Quote]