NO SPARK
Thread Starter
Teching In
Joined: Jun 2003
Posts: 18
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From: Albuquerque, NM
NO SPARK Hello gentlemen. First let me state how much of an asse t this website has been during my conversion. I have just recently completed a re-incarnation of my 1951 Mercury choptop. It's got a grocery list full of mods but the wildest one has to be the 98 LS1 I installed. I just last weekend filled the radiator and completed all the wiring. I attempted to start the beast but I got no-where. I am using a haywire harness. My less than expert eyes can only see what is obviously wrong. The fuel pump relay is not activating, and I am not seeing any spark on the plugs during cranking. Any guidance offered wil be welcomed with open arms. Thanks
Milkman
Milkman
Re: NO SPARK oh boy, I hate electrical issues. No spark, where to start. Check the plug on the crank position sensor, check all harness grounds, check all connectors. Basically, go over the entire harness again.
Glad our site has been useful, be sure to share some photos when you are complete!
Tony
Glad our site has been useful, be sure to share some photos when you are complete!
Tony
Banned
Joined: Sep 2002
Posts: 1,298
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From: So Cal, CA
Re: NO SPARK make sure its not sparking on both sides...when i first got my ls1swap running, the motor started and ran, but i had an entire coil back on one side not firing....so it was on 4 cylinders on one side, and i always check the other side, so i thought all 8 didnt have fire.
Thread Starter
Teching In
Joined: Jun 2003
Posts: 18
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From: Albuquerque, NM
Re: NO SPARK Thanks for the input. As far as the VATs is concerned the haywire harness incorporates a vats plug-in module. Is there anyway to test if it is working? I checked both sides and niether one had spark. I am kinda under the belief that the no spark condition is a result of something else since the fuel pump is not activating either. I was under the impression from some other post that it should com on momentarily after the computer get power from the key. My next step was to get a diag code reader. But to be honest I have never used one. Do they come with the appropriate docmentation to decipher the codes?
On The Tree
Joined: Jul 2002
Posts: 160
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From: Sterling, VA
Re: NO SPARK Once you get the reader deiphering the codes is not a problem. I do not know if there is a way to test the VATS defeat module. The fuel pump should activate for a few seconds to pressurize the system. That's why I think it's vats related. No Spark or fuel. I think a code reader will save you a lot of time trying to track this down.
Re: NO SPARK No fuel relay no spark =VATS....the only way of checking if by lookin for a signal on the vats feed wire usually color blue ...but if i can remember there should be spark at least ...so ground should be checked check if front O2 sensors are gettin warm with the ignition on that will tell you if ya have a nice ground...hmmm but its most likely the vats module
Trending Topics
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Re: NO SPARK VATS doesn't affect the fuel pump relay or spark, so you probably need to be looking in a different direction.
You probably have a wiring error, or faulty ignition switch, or hooked up to ignition switch wrong.
You probably have a wiring error, or faulty ignition switch, or hooked up to ignition switch wrong.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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Verdad Gallardo Re: NO SPARK in my 2001 ls1 engine vats does control the fuel pump relay ad the starter but if you get it to crank manually the engine will still fire up for like 2 seconds and then stall....so how bout some ground checking and making sure there is power goin to coils and injectors while ignition on ....bad computer ?jump wire direct to pink wire on injector 1 on driverside and 2 on passanger side to the positive side of batt....manually power the fuel pump and run power to coils....is crank and cam sensors connected right ?
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Re: NO SPARK No it doesn't. VATS has never controlled the fuel pump relay on a GM application. It controls injecter pulses from the PCM. BIG difference.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Re: NO SPARK How's it coming along?
Sounds like you have a fundamental wiring problem if the fuel pump and the ignition aren't working.
All the grounds there?
Nice project, I'm a big lead sled fan.
Sounds like you have a fundamental wiring problem if the fuel pump and the ignition aren't working.
All the grounds there?
Nice project, I'm a big lead sled fan.
Thread Starter
Teching In
Joined: Jun 2003
Posts: 18
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From: Albuquerque, NM
Re: NO SPARK Good news. I found a loney power lead kind of hidden in the belly of my ride. It was the battery lead for the PCM. I am guessing that would a little bit important. Hooked it up an voila the monster came to life. What a sweet sound. I felt good untill I noticed the volt meter showing 11.5vdc. I figured the alt. that came with the motor was bad so I replaced it and again all I got was 11.5vdc. Tested both of the bad ones and confirmed that they were bad. Knowing what kind of crap repop alternators are I chose to get another one and pretest it. Looked good on the tester but only showed 11.5 on the car. I was referenceing a post from the archives on how to hook up the alternator. I used that stock plug and connected 12vdc thru a diode to the B pin. Is this all I need? I now think I am frying all of these alternators.
Milkman
Milkman
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Re: NO SPARK Don't use a diode!!
Use a 500 ohm resistor.
I covered that in-depth some time back. You must have referenced the wrong thread.
Use a 500 ohm resistor.
I covered that in-depth some time back. You must have referenced the wrong thread.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
