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New To Me Truck.. Lemon.. 98 Z71

snakenate

By snakenate
in Ask A GM Technician

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snakenate Enthusiast

snakenate

Posted
Posted

I have just bought a 98 z71 5.7L truck. I needed a new truck for work so I did not have a lot of time to shop around. I payed about $6500 for this truck and thought it was a good deal. However the day after I bought it when I cranked it up it knocks for a few seconds, it does this almost every time I crank it. I think I bought a truck with a blown engine. My luck.. I have previously owned toyota trucks and this is my first full size truck. Think I will stick with my little japanese friends after this experiece. Any ideas? Thanks guys.

ZZ327 Senior Enthusiast

ZZ327

Posted
Posted

Its your fault for not checking it out, and buying one that wasnt taken care of !! Are all you import owners like this?

 

Start out with taking it in for a full service, it could be something simle like a PCV valve.

Zembonez Senior Enthusiast

Zembonez

Posted
Posted

Let's see... It's 10 years old... you don't mention how many miles but lets assume at least 120K - and you immediately call it a lemon becaust you "think" it might have an engine issue. Perhaps you should own a japtruck. If you are not a mechanic (and I am assuming that is the case) Why did you not have one look the truck over prior to buying it? I don't mean to be harsh but what were you expecting?

 

Seriously, the knock on startup issue might not be a biggie. It may even be lifter noise. Change the engine oil using premium oil and filter. Don't go to Wallymart ot QuickieLube. See if the noise changes. If not then take the truck to somebody that knows GM engines and get their opinion.

jhm Senior Enthusiast

jhm

Posted
Posted
I have just bought a 98 z71 5.7L truck. I needed a new truck for work so I did not have a lot of time to shop around. I payed about $6500 for this truck and thought it was a good deal. However the day after I bought it when I cranked it up it knocks for a few seconds, it does this almost every time I crank it. I think I bought a truck with a blown engine. My luck.. I have previously owned toyota trucks and this is my first full size truck. Think I will stick with my little japanese friends after this experiece. Any ideas? Thanks guys.

Dosent sound like a big deal to me. If it was a conn rod it would do it constantly. Probably just dirty. Drain the oil, do a engine flush, refill. If it still sounds bad take it to somebody trustworthy, find someone by word of mouth if you dont know a good mechanic.

syd-jai Enthusiast

syd-jai

Posted
Posted

Uh, sounds like Cold Start Knock to me. CSK. Go to the "Light Duty FullSize" forum above and search for Cold Start Knock.

There is 4 pages of topics.

 

Like here:

http://www.gm-trucks.com/forums/index.php?...old+start+knock

 

Common problem. GM says its no big deal. My 2000 silvy does it with some oils and not with others. My 01 yukon doesn't do it at all.

If you look at the poll, almost half the responders have it on their truck.

 

So sit down, drink a beer, relax. Your truck is fine. Change the oil and filters, (good to do on a used vechicle after purchase anyway), and chill out.

 

If it still bugs you, I'll give you $500 cash to take it off your hands. I can always use another truck!!! :crackup:

bbwb Enthusiast

bbwb

Posted
Posted

I believe that the computers are set up to over advance on an initial start up to cause "knock" so that the knock senser can read the signal and adjust. This would just be for a second or so. If the knock is longer, then what the others have posted.

bbwb

99silverado1500 Senior Enthusiast

99silverado1500

Posted
Posted

It can be a lemon, the 350s were a pretty solid engine, and dont have cold start knocks. Id be knockin on the guys door that I bought hte truck from and askin for some money back.

jhm Senior Enthusiast

jhm

Posted
Posted

If it still bugs you, I'll give you $500 cash to take it off your hands. I can always use another truck!!! :cheers:

 

He only paid $400 for it. :cheers:

snakenate Enthusiast

snakenate

Posted
  • Author
Posted

Thanks for the replies, most were helpful advice, some were from arrogant people, probably the same ones I always ended up pulling out of mud holes with my toyota.. Anyhow, I changed oil and the noise stopped. The sticker on the window said the oil change was due in March, but the mileage was still under the limit, however, the oil was THIN. That was it tho, I hope.. Other than that I am happy with it. Thanks again to the guys with HelpFul advice.

 

Cheers,

Nayte

arz71 Enthusiast

arz71

Posted
Posted
Thanks for the replies, most were helpful advice, some were from arrogant people, probably the same ones I always ended up pulling out of mud holes with my toyota.. Anyhow, I changed oil and the noise stopped. The sticker on the window said the oil change was due in March, but the mileage was still under the limit, however, the oil was THIN. That was it tho, I hope.. Other than that I am happy with it. Thanks again to the guys with HelpFul advice.

 

Cheers,

Nayte

 

 

Toyota has all sorts of problems especially with the new 'Tundra 5.7' it is breaking cam shafts like popcorn. So much for the motto 'it is built better' if it was why would a brand new $40,000 truck being snapping cam-shafts the Tundra. Don't believe me look it up on any search engine Toyota is replacing engines in brand new trucks.

 

No thanks I will stick with my Chevrolet's and you can keep the import junk.

ZZ327 Senior Enthusiast

ZZ327

Posted
Posted
Thanks for the replies, most were helpful advice, some were from arrogant people, probably the same ones I always ended up pulling out of mud holes with my toyota..

 

 

 

Cheers,

Nayte

 

 

You reply like this and call your 10 year old used pickup a lemon? While talking alittle s**t about GM. And those guys are the arrogant ones?

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
Thanks for the replies, most were helpful advice, some were from arrogant people, probably the same ones I always ended up pulling out of mud holes with my toyota.. Anyhow, I changed oil and the noise stopped. The sticker on the window said the oil change was due in March, but the mileage was still under the limit, however, the oil was THIN. That was it tho, I hope.. Other than that I am happy with it. Thanks again to the guys with HelpFul advice.

 

Cheers,

Nayte

 

We might be arrogant but our replies were intended to help.

 

Oh, wait...we are arrogant! Welcome to the club.

jhm Senior Enthusiast

jhm

Posted
Posted
Thanks for the replies, most were helpful advice, some were from arrogant people, probably the same ones I always ended up pulling out of mud holes with my toyota.. Anyhow, I changed oil and the noise stopped. The sticker on the window said the oil change was due in March, but the mileage was still under the limit, however, the oil was THIN. That was it tho, I hope.. Other than that I am happy with it. Thanks again to the guys with HelpFul advice.

 

Cheers,

Nayte

You buy a 10 year old truck and don't even change the oil, then you say it is a lemon. Good luck down the road, your gonna need it. BTW, who are the "arrogant people"?

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