Error code 42, DIS module broken?
Thread Starter
Drifting
Joined: Aug 2000
Posts: 1,393
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Error code 42, DIS module broken?
I just heard that after fuel injector change I have Service Engine Soon code 42.. Corvette service here thinks that my DIS module might be broken and they told that its very expensive.. 
Any ideas/help?
Any ideas/help?
Race Director
Joined: Dec 2003
Posts: 14,138
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From: Fremont Ca
2022 C4 of the Year Finalist - Modified
If this is the jobber bolted to the underside of the plenum check to make sure it plugged in correctly or that one of the pins wasnt bent while being plugged in.Who did the work on the car?Getting the plugs connected are a pain in the a$$,awkward because of no room and delicate because you dont want to bend the pins.The spark module starts at $700 and goes up from there.If this was fine before the car came apart I would venture to say its not hooked up correctly.
Tech Contributor
Joined: Aug 2006
Posts: 9,933
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From: Peoria Arizona.. Resident Gold Cylon
They either unplugged or broke the connector as it is under the plenum like Jeff states. Before I do anything I would unhook the battery wait 30 secs and plug it back in and then make sure all the codes are cleared before Id pull that plenum again. THe ECM is a likke quirky. GC
Burning Brakes
Joined: Oct 2001
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From: NORTHRIDGE CALIFORNIA
Melting Slicks
Joined: Jul 2004
Posts: 2,907
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From: Jupiter Florida
You need to check (4) connectors to make sure they are not damage and fully seated>
There are two front connectors...when looking under the plenum (this view if front to rear) they look like this (red arrows)>>>
Then there are two rear connectors... one is a clip on style and one is push on with a 1/4" bolt>>
The front two connectors are fairly easy to install and snap into place...they have different style connectors so there is no way to get them reversed. Now the rear two connectors are more difficult to install and you really need to wiggle them firmly into place.
Michael
There are two front connectors...when looking under the plenum (this view if front to rear) they look like this (red arrows)>>>
Then there are two rear connectors... one is a clip on style and one is push on with a 1/4" bolt>>
The front two connectors are fairly easy to install and snap into place...they have different style connectors so there is no way to get them reversed. Now the rear two connectors are more difficult to install and you really need to wiggle them firmly into place.
Michael
Tech Contributor
Joined: Aug 2006
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From: Peoria Arizona.. Resident Gold Cylon
Thread Starter
Drifting
Joined: Aug 2000
Posts: 1,393
Likes: 0
Corvette service here has check connectors and pins. I did talk there last time today at phone. He has done diagnostics of shop manual and it looks like bad DIS module. Battery has been disconnected for night, but code 42 comes back. Also this shop told me that its really uncommon that DIS module is broken. I had one SES code before when car start run bad after car wash, it run really rough and got code. I dont know what code was and it got away.. Now at service after fuel injectors change code is back again
Anyone has extra DIS module that I could try/buy..
Anyone has extra DIS module that I could try/buy..
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Le Mans Master
Joined: Oct 2004
Posts: 6,314
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From: South-central Missouri
DIS failure
Post this on http://www.zr1netregistry.com/forum/...ysprune=-1&f=9 (ZR-1 Net Registry). Marc Hiabeck told me he rarely sees a DIS failure, under normal circumstances. However, he went on to say that if the heat sink zinc oxide (white goop) is not used, or if some debris or sand gets between the DIS and the mating surface on the plenum, then he has seen that situation result in DIS failure in very short order!
Let's hope it isn't the DIS.
P.
Let's hope it isn't the DIS.
P.
Melting Slicks
Joined: Dec 2004
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From: Jacksonville, FL
St. Jude Donor '08 thru '26
Try sending a PM to Rod.
http://forums.corvetteforum.com/c4-z...s-sensors.html
I just bought a DIS module from him as I am having the same DTC42 on my 90.
In the same vein, Paul does Mr Haibeck say if we should use something like the paste that is used to bed PC processors to the heat sink? The FSM says to use dielectric grease. Now I'm wondering what to use when I replace my DIS.
TIA
http://forums.corvetteforum.com/c4-z...s-sensors.html
I just bought a DIS module from him as I am having the same DTC42 on my 90.
In the same vein, Paul does Mr Haibeck say if we should use something like the paste that is used to bed PC processors to the heat sink? The FSM says to use dielectric grease. Now I'm wondering what to use when I replace my DIS.
TIA
Thread Starter
Drifting
Joined: Aug 2000
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It still doesnt work..
I have new fuel injectors from Jon, DIS module changed and new spark plugs..
Car runs bad when its cold, it run rough and I can feel vibration.
Its gets better when engine is warm, service talk something about closed/open loop.
Today engine did die two times.. I couldnt start it.. I had to wait some time before it start... I think spark plugs got wet of fuel.
Service guy here says that Jon did send me wrong injectors and those are way too big for my car.. Jon says that it isnt true and injectors are same as orginal.. I go nuts..
I have now used 1500 euros.. Car still doesnt work.. I dont know what to do..
I need collection to fly Haibeck to Finland..
But seriously.. I dont know what to do..
I have new fuel injectors from Jon, DIS module changed and new spark plugs..
Car runs bad when its cold, it run rough and I can feel vibration.
Its gets better when engine is warm, service talk something about closed/open loop.
Today engine did die two times.. I couldnt start it.. I had to wait some time before it start... I think spark plugs got wet of fuel.
Service guy here says that Jon did send me wrong injectors and those are way too big for my car.. Jon says that it isnt true and injectors are same as orginal.. I go nuts..
I have now used 1500 euros.. Car still doesnt work.. I dont know what to do..
I need collection to fly Haibeck to Finland..
But seriously.. I dont know what to do..
Last edited by Mylzi; Oct 1, 2009 at 02:13 PM.
Tech Contributor
Joined: Aug 2006
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From: Peoria Arizona.. Resident Gold Cylon
Thats what I would try next. Its not so much the mileage as it is the time on the coils. Suggest replacing with regualr Delco coil. There are others out there but the Delcos will work fine. How amny miles are on the car?
Thread Starter
Drifting
Joined: Aug 2000
Posts: 1,393
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I have about 125000km.
- No SES active code.
- Run bad when cold.
- I think it run too rich, course engine die two times, couldnt start after it, maybe after 5-10min it did start again, maybe plugs got wet.
If its about open/closed loop.. Why it does better when warm.. I didnt check temp, but at cold I can feel vibrate and rough running.
It does enter to closed/open loop when engine get warmer? Could it still be bad coil?
- No SES active code.
- Run bad when cold.
- I think it run too rich, course engine die two times, couldnt start after it, maybe after 5-10min it did start again, maybe plugs got wet.
If its about open/closed loop.. Why it does better when warm.. I didnt check temp, but at cold I can feel vibrate and rough running.
It does enter to closed/open loop when engine get warmer? Could it still be bad coil?
