I have a 1984 Z28 has like a carbon knock also has a miss and spits back thru carb when at full throttle
getting code 41 on obd . cant find a cam position sensor nor a electronic spark module any help would be appreciated.
Thanks,
Carlope

 

No cam sensor , 41 should be for faulty or incorrect prom or bad ecm.

 

Thanks

 

is there anyway to test I just took ecm out from under pass side also how do you get prom out of ecm ? don't want to tear anything up
Thanks again

 

If you pull the prom to reseat it be careful the pins damage easily. You might want to look at the service number and look on eBay for a replacement ecm.
There should be 3 letters on the service tag or on the chip. These letters identify the prom vehicle application engine size, transmission type. Other codes will work for the same application and if listed I can identify them if you need. No way I know to test the ecm and little support for the prom.

 

Thanks Again see what I can find on e-bay.
CJT is three letters on tag and chip. Service # 1226455

 

Found a few on ebay would need to know what 3 letter codes are compatible?
Thanks for your help.

 

Here is the reason for code 41:

41- no distributor signals to ecm, or faulty ignition module ( carbed models)

There is someone else here that has been fighting this code for quite a while. Can't find his thread but IIRC he is from either Great Briton or Germany.

I posted the troubleshooting of this code in his thread. The baro sensor plays an important role. The ECM uses it to know whether the engine is running or not.

RBob.

 

Just found the thread:

https://www.thirdgen.org/forums/tech...de-41-lg4.html

RBob.

 

Great information rbob, sorry to lead you astray with ecm information different years different meaning of the codes.

 

Thanks Guys
give it another look

 

had ignition module tested it said it was ok but going to replace anyway. The connector with capacitor that connect to module
was pretty much toast looks like it got real hot the insulating cover fell into pieces. Had to order that part. Just to keep you informed.
Thanks Again for the advice.
Carl

 

Got back together seem to be problem in a way the knock I have been hearing is coming from the distributer.
will distributer pull out ok or do I need to know anything special and I have heard you have to disconnect a wire somewhere to reset
timing since it does not use a vacuum advance.
Thanks

 

There are four wires exiting the distributor that lead to a 4-wire connector. Open it to set the timing to base.

RBob.

 

Thanks RBob
Just hope it will pull out ok?