Post by
NolimitZ32 »
https://forums.nicoclub.com/nolimitz32-u100070.html
Mon Sep 12, 2022 9:41 am
That all depends on the available funds the OP has to play with. Plenum removal isn't necessary for an injector swap, one can use the Dremel method. But to do it right its best to remove the plenum, replace the upper plenum gasket (cheap) and perform the coolant bypass. Servicing/cleaning injectors costs about $20 each. Buying new Phase 1 injectors (if you can even find them) costs $135 each. The Phase 2 kit w/adapters is $700. If the original injectors are within spec there is no NEED to change them. If funds allow then yes its best to replace the originals with phase 2 + adapter. But the difference between $120 and $700 or $800 is a sizeable one for many people, especially if you're hunting down an issue that may end up requiring a more sizeable investment to cure.
OP I missed the part about your readings being all over the place. Are you OHMing the injectors with the engine off at the contact or through the back of the plug while running? I know it seems pretty obvious, just want to make sure. How have you attempted to clean the contacts? If you're using the correct procedure to OHM them then corrosion would definitely play a role in odd readings and in rough running. If your idle evens out at slightly higher RPM like you mention then the culprit can be any of the following being at the tolerance threshold: Mechanical Compression, Electrical Limit MAF, Electrical Limit Injectors (failing coils), Mechanical Limit Injectors (dirty), Incorrect timing (CAS angle). Troubleshoot the things that can be tested first then start swapping parts otherwise the cost can easily get away from you.
The main point to all of this is to diagnose properly and not jump to conclusions even though a good portion of the time the conclusion may be right.