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Fuel + Spark = Still Won't Run!?!?!?!?!?

  • Thread starter Thread starter onebad7up
  • Start date Start date Oct 21, 2008

onebad7up

Member
Jun 21, 2004
97
0
6
Nashville
Oct 21, 2008
#1
  • Oct 21, 2008
  • #1
I have a 1989 Gt Vert and it used to have a h/c/i setup with a 60mm turbo kit. There were numerous supporting aftermarket parts on it as well.

Over the past few months I have taken it back to stock. Now that I am finished I cannot get it to run. Timing is popping through exhaust. This motor ran great before I put it in.

I am thinking that is a TFI wiring issue because a number of electronics were disconnected.

I took some readings tonight and I was wondering what everyone thought looked wrong.


With key 'ON'

Blue - 0 V
Y/G - 0 V
R/Bl - 120's mV
R/G - 10.7 V
G/Y - 4.35
Blck - 0 V



While Cranking

Blue - 0 V
Y/G - 0 V
R/Bl - 0 V
R/G - 5 V
G/Y - 4.35
Blck - 0 V


The one thing I noticed was the R/ Blue did not receive power on cranking. Is there anything else that is weird?
 

hotcobra03

Active Member
Nov 29, 1999
969
4
39
poteet,tx
Oct 22, 2008
#2
  • Oct 22, 2008
  • #2
Check direction on dist.and fire order,plugs can foul out with to much gas,popn sounds are timing related
 

the pony boy

Founding Member
Apr 19, 2002
358
0
16
10512
Oct 22, 2008
#3
  • Oct 22, 2008
  • #3
i would say timing.search for top dead center.theres a ton of writeups for it.good luck phil
 

onebad7up

Member
Jun 21, 2004
97
0
6
Nashville
Oct 22, 2008
#4
  • Oct 22, 2008
  • #4
We have checked for TDC probably 5 times. It has new plugs. Tried different dizzys. Checked firing order. Swapped ECU's.

I am running out of options, which is what brought me back to wiring.

Any thoughts on the wiring?
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Oct 22, 2008
#5
  • Oct 22, 2008
  • #5
Do you have spark? Based on those number, I'm not sure you do.
 

onebad7up

Member
Jun 21, 2004
97
0
6
Nashville
Oct 22, 2008
#6
  • Oct 22, 2008
  • #6
Well it is popping out the exhaust so I think I do. I tried a couple cylinders with my spark tester and they lit up.

What do you think could be happening?
 

hotcobra03

Active Member
Nov 29, 1999
969
4
39
poteet,tx
Oct 23, 2008
#7
  • Oct 23, 2008
  • #7
I once was in a rush when installing wire after a cam swap.everything looked good and the direction was wrong but firing order was right.
 

thexrcist68

New Member
Apr 22, 2006
63
0
0
Spotsy County, VA
Oct 23, 2008
#8
  • Oct 23, 2008
  • #8
sounds to me like youre 180 out on the distributor, or on the cam
 

1987stangman

Member
Jul 12, 2006
684
24
19
Oct 23, 2008
#9
  • Oct 23, 2008
  • #9
thexrcist68 said:
sounds to me like youre 180 out on the distributor, or on the cam
Click to expand...

Yea, it sound like you may have TDC but is it TDC on the number one piston at it's compression stroke?
 

thexrcist68

New Member
Apr 22, 2006
63
0
0
Spotsy County, VA
Oct 23, 2008
#10
  • Oct 23, 2008
  • #10
the popping from the exhaust would tell that cyl 1 is on tdc of the exhaust stroke, pull the dizzy out and turn the rotor 180 degrees, and drop it back in leave everything else the same, it'll fire
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
Oct 24, 2008
#11
  • Oct 24, 2008
  • #11
While cranking, the TFI needs to see voltage at the start-signal-in terminal. If that's missing, it's tough to start the car.

It's real quick to check spark and injector pulsing. You can hook an inductive timing light to a random plug wire to see if you have spark. A noid light makes it easy to check injector power and ground.

If you have those, I'd consider the TFI is probably ok for now. The above-thoughts regarding being out of phase are quite possible.
 
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