My '97 was throwing a P0305 code and replacing the plugs/wires did nothing to clear the codes, neither did swapping coilpacks. I tested the fuel injectors and #5 was bad, it had a really high ohm reading.

I replaced all 6 injectors and re-assemble the car. It stumbled pretty bad at the start and threw a P0303 code, I reset it and it started to get better. I thought it was just the vasoline (I used probably too much) burning off that I used to lube the o-rings , as other members have commented on this.

After a few more miles of driving it threw a P0125 code. I reset it again and now it accelerates fine and runs at high RPMS ok but still stumbles badly at idle. Now it's throwing a tons of codes: P0171, P0300, P0301, P0302, P0303, P0304, P0305, P0306.

I'm not sure what to do now, any ideas. It seems like it points to a fuel leak but I don't smell any obvious gas scents in the engine bay.

Any help would be appreciated...

 

I've done some searching, maybe I have a vacuum leak now? Any other ideas?

 

Make sure there all seated correctly, all the wiring is attached. You don't need a lot of vaseline on the rubber gromets, that could be the issue. Make sure everything is tightened and in its correct spot. I know the gas rails can be tricky to take off and put back correctly.

I've had to replace 1 injector and had to do it twice due to it being seated incorrectly..gas all over.

Bob

 

I don't have any leaking gas into the engine bay, but I think I will do it over again and see if that helps.

The gaskets on the plenum do not need to be changed right? Maybe there is a leak there.

 

The gaskets on the plenum are listed as non-reusable per the FSM as is the the metal gasket between the throttle body and the plenum.

 

Due to my mileage and being the third owner, I replaced all the gaskets, rubber grommets and whatnot. I had to do it twice also, so don't feel bad. Just make sure you have no leftover bolts or screws.

 

Do you have the part number for the gaskets?

 

This morning I started the process over to replace the fuel injectors and when I got to the upper plenum the bolts/nuts securing it were loose. In the rush to put it back together the first time I had only finger tightened them and forgot to torque them down, causing a massive air leak. I torqued them down, put the rest back together and fired it up. It's running great now.


Lesson learned: don't be a dummy and take your time putting everything back together!

 

It's nice to find the cause before you had to dig all the way back into it. Your vacuum leak idea back in post 2 panned out bigtime.

Many of us have made a mistake like that....it just seems to be part of wrenching.