Help Needed, starts but wont run

Reply Subscribe

Thread Tools

Search this Thread

Sep 27, 2010 | 08:26 PM

#41

020NN20

Thread Starter

9 Second Club

iTrader: (13)

Joined: Apr 2006

Posts: 155

Likes: 0

I can check the signal voltage with a t-pin right? To rule it out anyway, evn if it was seeing the 4.5 volts, wouldnt it still fire and rev up with the throttle open??

Sep 28, 2010 | 12:00 AM

#42

98Z28CobraKiller

Restricted User

iTrader: (17)

Joined: Nov 2005

Posts: 5,783

Likes: 5

From: WPB, FL

Quote:

Originally Posted by 020NN20

I can check the signal voltage with a t-pin right? To rule it out anyway, evn if it was seeing the 4.5 volts, wouldnt it still fire and rev up with the throttle open??

4.5v = 100% Throttle position. Pretty much all tunes have a 100% TPS clear flood condition. What this means is that if the motor is flooded, you hold the throttle wideopen and turn it over. The computer shuts off the injectors to help clear out the fuel in the cylinder. Most stock tunes are set at about 80% TPS clear flood. If you disconnect the TPS, or cut the signal wire, the TPS goes to full voltage (4.5-5.0) which equals 100% or WOT throttle. If the car previously has had or has any WOT electronic switches wired in, the TPS signal wire has been tapped.

I would think all you would need is a voltmeter with a sharp probe and to know which pin it is at the PCM.

Sep 28, 2010 | 07:13 AM

#43

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

Got it figured out yet? Do you have a MAP adaptor harness on the car? What injectors are you running & are they low or high impedance?

Sep 28, 2010 | 04:24 PM

#44

020NN20

Thread Starter

9 Second Club

iTrader: (13)

Joined: Apr 2006

Posts: 155

Likes: 0

I have 80lb./hr. injectors, high impedance(no driver) which ever stock is...drawing a blank right now, I have the stock MAP plug, with extended wires to go the the map sensor, due to the intake having such a high mount for the MAP. What harness? my plug goes right into the MAP sensor i have, its a gm sensor, do i need an adapter?? Maybe thats my issue?!?!?

Sep 28, 2010 | 04:25 PM

#45

020NN20

Thread Starter

9 Second Club

iTrader: (13)

Joined: Apr 2006

Posts: 155

Likes: 0

Im getting a snapon genesis scanner, finally a real scanner today, what all do i have to look at, so far i know of the tps and map readings...anything else??

Sep 28, 2010 | 06:41 PM

#46

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

Quote:

Originally Posted by 020NN20

The type of MAP sensor you have dictates if you need a harness or not, I have a GM 3 bar, 3 wire sensor but the plug is a little different, its also the type that requires a vacuum line. I bought a harness adapter and after pulling my hair out for 3 days trying to figure out why it would crank run for just a sec and die realized that 2 of the pins were in the wrong cavities. Not saying its your problem but it sure drove me nuts.

Sep 28, 2010 | 06:43 PM

#47

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

Quote:

Originally Posted by 020NN20

Im getting a snapon genesis scanner, finally a real scanner today, what all do i have to look at, so far i know of the tps and map readings...anything else??

View real time data on the scanner, with the key on and the engine NOT running the MAP should read 100KPA.

Oct 1, 2010 | 05:26 AM

#48

020NN20

Thread Starter

9 Second Club

iTrader: (13)

Joined: Apr 2006

Posts: 155

Likes: 0

Ok, so I didnt forget about you guys, just been busy lately, was running part numbers double checking everything and I ran the part number for the MAP sensor on here....its a 3.3 bar, WTF!! So being tuned for a 2 bar is obviously not gonna work. Now the question is do I tune it for the 3.3 BAR or go and get a 2 BAR MAP sensor from GM? And if so, what part number is the 2 bar that I need, direct replacement style, 12580698? Thanks again guys

Dennis

LS1 Tech Stories

The Best V8 Stories One Small Block at Time

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Oct 1, 2010 | 02:34 PM

#49

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

Quote:

Originally Posted by 020NN20

Glad you got it all figured out. Here's a list of MAP sensor part#'s

http://www.hptuners.com/forum/showpo...72&postcount=3

Oct 1, 2010 | 02:53 PM

#50

BLK02WS6

9 Second Club

iTrader: (2)

Joined: Jul 2002

Posts: 2,583

Likes: 1

From: on the dyno tuning in MD

So, it was the MAP sensor after all... I would get a 2 bar sensor.

Oct 1, 2010 | 04:52 PM

#51

020NN20

Thread Starter

9 Second Club

iTrader: (13)

Joined: Apr 2006

Posts: 155

Likes: 0

Ya I did, runs like a champ, its amazing what happens when you put the right parts in the car, lol.. Thanks to ALL of you guys for all the help and feedback, I'll see if I can post a build thread or video soon!!!! P.S. sounds like a jet plane!!!!

Oct 1, 2010 | 07:20 PM

#52

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

Quote:

Originally Posted by 020NN20

I love an open dumped wastegate!

Oct 2, 2010 | 09:07 PM

#53

020NN20

Thread Starter

9 Second Club

iTrader: (13)

Joined: Apr 2006

Posts: 155

Likes: 0

Ya, definitely sounds sick, put the wideband on it today, to make sure im not g oing lean at all while driving around, even short bursts at only 6-7 pounds of boost, its at 11.6. Thanks to speed inc. on gettin damn close on the tune!!! Only one issue...I can drive it all around, doing whatever, but as soon as I do a lil burst, it wont idle....let it sit for a lil while, start it up, and its better again...wondering if its maybe hitting knock? Imma put in some 110 tomorrow and see what happens(if it is knock, then it wont do it on 110 on only 7 pounds) AFR is good, dunno, either way, i can drive around and its all worth it!!

Nov 3, 2010 | 11:39 PM

#54

hpbob1

On The Tree

iTrader: (1)

Joined: Oct 2009

Posts: 101

Likes: 0

How is she running now?

Hi 020NN20,

Glad ya got it sorted out! Any build thread pics? I am about to start my build thread as well with a similar drive train. I have a 74 camaro, 6.0 LQ4 (317's), built turbo 400, 3.73 gears, will be running the pro flo xt intake with a 75MM turbo.

What year is your trans am, cam specs? By nice 317 heads are they ported? I may try to lightly home port mine with a nice valve job. Luv to hear more details on your car, combo, drive train. I want mine to get down to about 3200 lbs with out me in it. Still deciding on what cam and how big of a cam to put in it. Guessing somewhere beween a LS6 and about a 600 lift turbo cam similar to Fm14 with a 114 LSA. My car will be a weekend warrior lots of strip and some street.

How do you like the Xt intake?

Hpbob1

Reply Subscribe