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Old 11-13-2009, 09:16 PM   #1 (permalink)
 
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Default Newb sierra q's urgent

Hi all. I just went to look at a 1991 sierra 1.3l carby motor with 161000 kms and i have a couple of questions which need to be answered soon because it's on ebay and only has 2 and a half hrs left.

Firstly:
It had a fair bit of shuddering when taking off in first, second and into third, the guy told me that this is normal for a sierra is that true?

Second:
When i pulled the spark plugs they were all very white (lean right?), but the tip of the exhaust was really black (too rich?), and i could see on the driveway where it had been leaving a trail of black stuff when it's started. It was also detonating a fair bit under load, (too lean, timing?). He said that it has recently had the head machined so i'm guessing that must have something to do with these problems? He also said that lately it hasn't been driven much, just started and left to idle...

Can anyone give me a possible diagnosis? Is it stuffed? Is it worth buying?

Cheers

Last edited by tablechairs; 11-13-2009 at 10:58 PM.
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Old 11-14-2009, 02:25 AM   #2 (permalink)
 
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Well i bought it, $2600 australian. Does anyone know about the shuddering on take off thing? I'm hoping that the spark/detonating is just an easy fix.
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Old 11-14-2009, 02:40 AM   #3 (permalink)
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I don't understand what do you mean by shuddering.

BTW, how do you know how much it's been, when the clock is only five digits long? It could be 261000 or 361000? Or does yours in Australia come with six digits?
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Old 11-14-2009, 02:59 AM   #4 (permalink)
 
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When accelerating at slow speeds there is a shuddering which seems to come from the rear end. Similar feeling to an unbalanced wheel. It only happens under load, and goes away at higher speed.

Yes we get 6 digits, where are you from that you only get 5?
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Old 11-14-2009, 03:01 AM   #5 (permalink)
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Quote:
Originally Posted by tablechairs View Post
When accelerating at slow speeds there is a shuddering which seems to come from the rear end. Similar feeling to an unbalanced wheel. It only happens under load, and goes away at higher speed.

Yes we get 6 digits, where are you from that you only get 5?
Is your Sierra lifted or not? What kind of lift, is it a SPOA? I have the exact year model, 91.

I'm living in the Middle East. Arabian gulf, in particular.
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Old 11-14-2009, 03:45 AM   #6 (permalink)
 
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Quote:
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Is your Sierra lifted or not? What kind of lift, is it a SPOA? I have the exact year model, 91.
No not lifted its completely standard except for it has dual shock absorbers in the rear, and slightly larger wheels. Not sure why you would want two shocks on each side but someone has installed an extra set...
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Old 11-14-2009, 05:04 AM   #7 (permalink)
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Originally Posted by tablechairs View Post
No not lifted its completely standard except for it has dual shock absorbers in the rear, and slightly larger wheels. Not sure why you would want two shocks on each side but someone has installed an extra set...
If you don't have a lift on it, then it sounds like a bad tire only.
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Old 11-16-2009, 04:16 AM   #8 (permalink)
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if it has dual shocks in the rear, its most likely to provide adequate dampening for a heavy load. Perhapse it was used for hauling heavy material in the bed, or for pulling a heavy trailer. A stock sierra doesn't weigh enough to justify more than one set of shocks in the rear.

The shuddering sounds like it could be from your universal joints or maybe from your rear differential. There shouldn't be shuddering... at any speed.

White powder on your plugs indicate that it has worn valve guides and needs them replaced. Black soot indicates too rich a mixture and partially burnt fuel in the exhaust.
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Old 11-16-2009, 06:16 AM   #9 (permalink)
 
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Could it be the clutch which is causing it to shudder? Ive heard that sierras are very hard on the clutch but not sure if a faulty clutch would act like this?
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Old 11-16-2009, 07:21 AM   #10 (permalink)
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i had bad shuddering accompanied by a loud vibrating noise a while back. mine was worst at around 70-80km/h... turned out that one of my u-joints had one of its four ends snapped and that end was able to move around. have u checked your u joints?
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