Stock Boost issue/question

mikew

mikew

New member
Ok so after the fresh tune up the new SY was running good but not great. It would not build good boost in over drive. So I looked at the vac lines from the waste gate and turbo to the solenoid. The line from the waste gate to the solenoid was on the wrong side, and there was No line from the left side of the solenoid to the turbo.

I put the line on correctly and put a new vac line on from the turbo to solenoid. It now build great boost but seems to much?? It easily burries the stock boost guage (yes I know its wildly inaccurate) I dont hear any ping or detenation.

I just want to make sure this is ok and I am not going to grenade the motor.

I am going to put a scan tool tomorrow and see what the max boost is coming up at

FYI this truck is 28k and all stock
 
Flyin Ryan

Flyin Ryan

hated cuz he drives fords
Re: Stock Boost issue/question

If it's a stock chip/map sensor truck then if your over boosting it'll cut boost/power/fuel and give you a check engine light. It's kind of feels like the truck falls on it's face for a sec or two then the check engine lite pops up in your face.

If it's an aftermarket chip then this is normally disabled and you should hookup a scan tool and see how much boost your running or install an aftermarket gauge. If it's a 3 bar map then the stock boost gauge will be completely useless
 
mikew

mikew

New member
Re: Stock Boost issue/question

I just hooked it up to my scanner OTC Genysis and max boost I saw was 14psi, I did get a knock signal and saw 8 degrees of retard for a split second, but heard to audible knock or ping? Is 8 to much even for a split second? I saw 3-4 otherwise on WOT at max boost 14

Forgot to mention 24 degrees timing advance accoring to scanner and AF ratio 14.7 if this helps?
 
neildemo

neildemo

Administrator
Re: Stock Boost issue/question

14.7 at idle is what my trucks run at and I have many. 8 is high for KR. 14psi is normal for a stock syty thats what all my trucks run at. Stock blocks handle 23psi so you have plenty of room. Only thing I would worry about is if its not a stock chip like previous posts. They take all the safetys off so be carefull.
 
mikew

mikew

New member
Re: Stock Boost issue/question

neildemo said:
14.7 at idle is what my trucks run at and I have many. 8 is high for KR. 14psi is normal for a stock syty thats what all my trucks run at. Stock blocks handle 23psi so you have plenty of room. Only thing I would worry about is if its not a stock chip like previous posts. They take all the safetys off so be carefull.
Click to expand...

Other than pulling the ecm and looking at the chip is there any way to tell for sure that it is stock?

Also just curious if when the scanner shows the IC pump is on, is that just a signal or does it really know if its on and working?
 
neildemo

neildemo

Administrator
Re: Stock Boost issue/question

Is it on right on Cold Start? Believe stock chip is supposed to engage the IC Pump at like 185. So you might have a aftermarket chip only way to tell is look in the ecm. Very easy to do. Now if your not sure if your pump is working or if you have a aftermarket chip that turns it always on. When the car is cold, just remove the IC cap you should see coolant moving I do on mine. Dont do it when its HOT!
Good luck! Check your Back relays as well theres a yellow wire if its grounded the pump will always stay on. One of my Tys had this mod done.
 
mikew

mikew

New member
Re: Stock Boost issue/question

The IC pump did not come on when it was cold. It seemed to come on once hot but I could not 100% tell if it was moving or just the vibration of the motor. My scan tool said it was "on" but when I shut it off and had key on engine off it said it was "on" but was not moving?

Will the pump work if the engine is not running?
Also my prom ID is 3961 per the scan tool I have not looked at it dores that sound like a stock ID?
 
neildemo

neildemo

Administrator
Re: Stock Boost issue/question

No pump will not work with engine off. Simple mod would be to ground out yellow wire on your relay
then everytime your ignition is turned pump should come on and you should see coolant flow if not you have a bad IC pump.
 
midnightbluS10

midnightbluS10

Banned
Re: Stock Boost issue/question

mikew said:
The IC pump did not come on when it was cold. It seemed to come on once hot but I could not 100% tell if it was moving or just the vibration of the motor. My scan tool said it was "on" but when I shut it off and had key on engine off it said it was "on" but was not moving?

Will the pump work if the engine is not running?
Also my prom ID is 3961 per the scan tool I have not looked at it dores that sound like a stock ID?
Click to expand...

3961 is a stock prom id according to http://syty.org/old/promguide.html

edit: it appears some aftermarket chips use a prom id of 3961, also. Pull the ecm and check it. Probably going to be a stock chip, but it never hurts to check.
 
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