testing for knock

**96brougham13** · 03-11-2011

i need to test my new modded 1997 gtp for knock to see if its actually running this 3.0" sc pulley right.

not sure whats exactly done but..

very large cam
3" exhaust
headers
3.0" pulley
some sort of pcm tune
valve train to match cam
larger injectors not sure on # (how can i determine what injectors i have?)

trying to figure out what has been done and if its going to blow.

how can i test for kr without spending a fortune. does caspers knock gauge work. I would like to really know numbers tho not just a couple led lights.

If anyone lives around the st. cloud MN area with a scanner that would be pretty cool but seems far fetched

**TheOtherNick** · 03-11-2011

Not sure of any local guys with a scanner around ya. I could hit ya up if I am ever up north.

**nascartech** · 03-11-2011

that almost sounds like the car chad use to have before he goit his t/a and if it is there is no kr

**KeithGTP03** · 03-11-2011

Im with ya man, I bought one from the dealership and thought it was stock besides the CAI. Thats not the case. It has been modded. Im wondering how to find out about the internals as well, like cam, rockers, shift kit. How can you tell without ripping it apart?

**Bio248** · 03-11-2011

Originally Posted by KeithGTP03

Im with ya man, I bought one from the dealership and thought it was stock besides the CAI. Thats not the case. It has been modded. Im wondering how to find out about the internals as well, like cam, rockers, shift kit. How can you tell without ripping it apart?

you dont.

**FoSHO99** · 03-11-2011

mnclubgp.com should have a few people near you with scanners or know the history of the car if it was purchased in mn.

**blueguy** · 03-11-2011

Originally Posted by KeithGTP03

Im with ya man, I bought one from the dealership and thought it was stock besides the CAI. Thats not the case. It has been modded. Im wondering how to find out about the internals as well, like cam, rockers, shift kit. How can you tell without ripping it apart?

Upgraded rockers minus modded 1.9's you can tell by taking off the oil cap and looking at them. A cam will idle rougher than stock...even a VS feels like a misfire.

**96brougham13** · 03-11-2011

thanks for the info.

nascartech...was his car black with tan interior with larger drilled rotors up front? I bought it form a guy in duluth and im not sure who he bought it from but thats who did all the work.

you can tell right away it has quite a lot of cam lift. I know the pcm has been tuned too cause the fans stay on for a min. or so after you shut off the car

**blueguy** · 03-11-2011

He didn't tell you what cam was in it?

**matt5112** · 03-11-2011

take a picture of the injectors.

get a video of the cold and warm idle.

**96brougham13** · 03-11-2011

ya i have the numbers. its a custom ground cam from comp cams. Intake lift is .556 and exhaust lift is .564. i do have some other numbers too.

**Bio248** · 03-11-2011

you can type the numbers on the cam card into comp's site and itll tell you what cam it is.

**TheOtherNick** · 03-11-2011

PRJ cam maybe? I think thats the lift numbers for it.

**96brougham13** · 03-11-2011

ya im not sure he just said it was custom ground from comp cams. Grind # GM38 3314/3315 HR113.0. All i really want to do is get it scanned for knock to make sure everything is good

**blueguy** · 03-11-2011

Easiest way IMO...and best tool for you is to buy an Aeroforce Scan Gauge.

**96brougham13** · 03-11-2011

ya i cant afford over $200 for it. Im going to be selling it soon just want to know if its knocking or not

**blueguy** · 03-11-2011

If it has a MPS system...buy a new pulley and toss it on there...like a 3.4"...it won't knock then.

**96brougham13** · 03-11-2011

i do have 2 bigger pulleys a 3.2 and a 3.4 i think. I just going to try and get my uncle to barrow his scan tool from the shop he works at.

**gtpsleeper** · 03-12-2011

if its got the headers,cam, and bigger injecters than the 3.0 should be fine since you said it had some kind of tune on it... if its nocking its very little...

**BlackSun** · 03-12-2011

What color are the injectors? Green are 42.5's.

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