Just Bought an 89 sho for 150 bucks off a buddy of mine who knows nothing about cars he was told the car ran and drove he found out it didnt he was getting no spark fuel pressure is good he had some one replace the crank sensor and the cam sensor apearantly the previous owner before him replaced the battery and the coil pace cel is on and the car will turn over but wont run my machanic said something about the dis modual and also sumthing about a different electronic control box underneath the radiator fan i looked the other day and there is that box underneath the radiator fan can anyone give me sum futher insight to what i should do
1989 sho no spark help!!!
- Thread starter davekar
- Start date
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BlackonBlack89
SHO Member
check the grounds. There is a important ground on the pass. side rear intake bracket. That is for the DIS. bad ground= no spark.
then check the DIS ( grey box on crossover tube) and then check the coil.
then check the DIS ( grey box on crossover tube) and then check the coil.
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Bob Gervais
Wut?
Make sure all the screws in the DIS are there.
luigisho
SHO Member
You need someone who knows what they're looking at as far as DIS grounds etc. Where are you in PA? Maybe there's some people nearby who can help.
frosho
WOLFMAN
They are part of the ground path for the DIS. As is the metal bracket between the crossover tube and rear plenum.
DIS -> crossover tube -> bracket -> rear plenum -> ground strap -> firewall
That's the ground path.
DIS -> crossover tube -> bracket -> rear plenum -> ground strap -> firewall
That's the ground path.
shotime1994
AirHammerAndrew
Just out of curiosity is the intake painted?
93rev2sev
SHO Member
Zach is correct. You should start on the firewall. Who ever gave him negative rep, you might have been too quick to judgement.
The intake ground strap will be easy to see there (at the firewall). It's a half inch thick, flat, braided, bare copper cable bolted to the firewall with a 7mm bolt. It's bolted along with a smaller insulated black grounding wire. To narrow down it's location, refer to the picture I'm about to post. You will need to test the ground path between that bolt head and one of the bottom 2 DIS bolts (the 5.5mm ones). Now that you've found it, get a pen light and try to follow it to it's other end. It better be connected to the intake manifold SOMEWHERE.
Now you need to test that ground path. The easiest way to do this is with a multi tester. Put the tester in "continuity tone" mode and touch the probes together. You should hear a tone. Now, place one lead on each bolt head. You should hear a tone again. This tone tells you that there is NO RESISTANCE between the two points. If that's the case, your DIS is grounded. To test this thoroughly, have a buddy hold one of the leads on one of the bolt heads and use your free hand to wiggle the ground strap, and all the wires in that bundle. Spend a couple of minutes veryfying that you can get a consistent tone from the tester. You can take some emery cloth or sand paper and scratch up the bolt heads to ensure a decent connection with the probes of the multi tester.
The intake ground strap will be easy to see there (at the firewall). It's a half inch thick, flat, braided, bare copper cable bolted to the firewall with a 7mm bolt. It's bolted along with a smaller insulated black grounding wire. To narrow down it's location, refer to the picture I'm about to post. You will need to test the ground path between that bolt head and one of the bottom 2 DIS bolts (the 5.5mm ones). Now that you've found it, get a pen light and try to follow it to it's other end. It better be connected to the intake manifold SOMEWHERE.
Now you need to test that ground path. The easiest way to do this is with a multi tester. Put the tester in "continuity tone" mode and touch the probes together. You should hear a tone. Now, place one lead on each bolt head. You should hear a tone again. This tone tells you that there is NO RESISTANCE between the two points. If that's the case, your DIS is grounded. To test this thoroughly, have a buddy hold one of the leads on one of the bolt heads and use your free hand to wiggle the ground strap, and all the wires in that bundle. Spend a couple of minutes veryfying that you can get a consistent tone from the tester. You can take some emery cloth or sand paper and scratch up the bolt heads to ensure a decent connection with the probes of the multi tester.
First, you should buy some punctuation marks.
Second, you should pull the codes.
Third, you should let us know what the codes are.
Then, we may be able to actually help you.
llamaking122
Green Machine
Also make sure everything is plugged in. ive forgotten before maybe the mechanic forgot sumtin
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Rockledge
Pluggin' away
Did you confirm for yourself that there is no spark to any of the cylinders?
The SHO DIS system is identical to the 3.8L SC. Check out: http://www.frontiernet.net/~miketoni/images/tbird/DISnostart/DIS No Start.htm
The SHO DIS system is identical to the 3.8L SC. Check out: http://www.frontiernet.net/~miketoni/images/tbird/DISnostart/DIS No Start.htm
got a chance to go and work on the 89 today turns out 2 of the screws in the dis box were missing went to pepboys bought a pack of 7mm screws and washers to fit cost about $1.97 went back put em in and turned the key started right up, it was the first time the motor has ran in prolly 3 or 4 years this car went through 4 other owners and no one could figured out that it was them 2 screws thanks Bob Gervais, for the advice thanks to everyone else for you input i really appreciate it motors running with a lil knock but doesnt sound like its coming from the motor idles a lil in and out prolly the gas thats been sittin in it for the last couple years gonna put sum high test to even it all out thanks guys
Bob Gervais
Wut?
Glad it was simple!
Search for the idle reset procedure on here, disconnect the battery and then reset the idle.
Search for the idle reset procedure on here, disconnect the battery and then reset the idle.
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