Crossfire Inj.-Rough running engine

[Monte Schimmer]

A bit of history: 82 model that sat too long without running. The hose connecting the fuel pump to th line disentegrated. I replaced the hose, tank sock, cleaned the tank, changed the fuel filters, put a kit in the cross-fire injection system, new plugs, wires, dist. cap and rotor.

Problem: Even though the car was running fine when it was parked before the hose incident, I can't get it to run smooth now. It runs like I have crossed plug wires. I have checked the wires three times and am certain they are correct and that there is continuity. I can see that the injectors are squirting gas into the throat. Any help will be appreciated.

Thanks
Monte

[lyndon sharpton]

Re: Crossfire Inj.-Rough running engine

check your EGR valve make sure it is working.

[Dick Whittington (8804)]

Re: Crossfire Inj.-Rough running engine

Is this issue at idle or all the time? In 1982 they had problems with what the TSB's called "Cold Idle Chuggle". The cars with this problem sounded like the engine was running on about four cylinders. There were numberous Prom updates to cure this problem. I worked on two that the updates made no difference. One of the owners installed a Hypertech prom and the problem went away.

If it is all the time, Lyndon has a good suggestion

[Monte Schimmer]

Re: Crossfire Inj.-Rough running engine

It's pretty much at all speeds though it's worse at idle. Sometimes it will idle, other times it will die. It seems to get worse as the car warms up. I haen't driven it, just ran it in the shop. Don't really want to get stranded.

Thanks,
Monte

[Michael Ward (29001)]

Re: Crossfire Inj.-Rough running engine

If you've been running it without driving it, could be simply a case of foulded plugs. Cheap and easy to replace.

[Ralph Harlan]

Re: Crossfire Inj.-Rough running engine

my '84 crossfire has O2 sensor problems that make it run very rich and sounds like it is on about 4 cyl. I have to replace the sensor screw mount (nut into the exhaust tube - headpipe - below the manifold) to be able to keep the sensor in the exhaust and just have not had time to do it yet - so the '84 sits patiently waiting. You might check your sensor function and also the assoc. wiring, though.

Also, make sure it is not something simple like the wiring for the injectors being switched or shorted to each other - had that problem also with the system. (mine was the bubba that got it b4 me and thought that if the wire for one injector quit then he could just wire both to the same harness and eliminate the wiring for the other injector. It ran - barely and got worse as it warmed up.) You'd still see fuel being injected to that bank, but it would be somewhat out of time.

[Mike Stapp (43589)]

Re: Crossfire Inj.-Rough running engine

make sure you did not cross injetor wires or injectors. the injetors have diffent flow rates. the drivers side will have white and blue wire.passenger side will be red and green wire.if not crossed your injetor openings may stopped up with that hose material.mike

[Monte Schimmer]

Re: Crossfire Inj.-Rough running engine

Thanks Mike,
I put each kit in one at a time. The problem started with the hose disintergrating, not after I did the tune-up. I can't help but think that something is plugged up somewhere although it could easily be a vacuum line somewhere. When it is running, it seems to have an even flow of gas coming out of the injectors. I have been a mechanic in the past(many years ago and on John Deeres and vehicles without computers) but know nothing about this type of computerized injection system. I started it last night and tried the lights and the headlight doors wouldn't open, so it may very well be a vacuum problem. I didn't realize how many vacuum lines there are on this car. Looks like I'll have my work cut out for me!!
Monte

[Mike Stapp (43589)]

Re: Crossfire Inj.-Rough running engine

monte check your injetor with a timing light shinning on them.you should have a cone shape mist spray with no droplets. mike

[Monte Schimmer]

Re: Crossfire Inj.-Rough running engine

I assume you mean to put the timing light on cyl 1 like I was checking the timeing? I can seen the spray cone and I have it coming out of both injectors without a timing light. Will the timing light help me to see droplets if they are there?
Thanks,
Monte

[Mike Stapp (43589)]

Re: Crossfire Inj.-Rough running engine

the timing light will help see droplets.

[Monte Schimmer]

Re: Crossfire Inj.-Rough running engine

Ok, if I see droplets, does that mean I need new injectors or something else. I won't be able to do anything until this weekend and am trying to get all of this into my mind so I know what to expect.

Thanks again,
Monte

[Mike Stapp (43589)]

Re: Crossfire Inj.-Rough running engine

the injetors are bad.mike

[Richard Beauchamp (36956)]

Crossfire rough running

Come to think of it, my 82 had a similar problem on the way to Windsor last year. Rough idle, low power, sounded like it was running on 6 or 7. That darn "Check Engine" light came on for a while, but then went off while driving. Finally stopped at the Chevy dealer, and he replaced the O2 sensor and cleaned the plugs. Then it ran great, with no problems since.

The O2 sensor is easily seen from the passenger side, on the exhaust. It looks like a wrench will pull it out easily. But I'm going from memory on what I saw at the time. It's probably cheaper to replace it yourself, rather than the dealer two states from home! Hope this helps.

Rich
#36956

[Monte Schimmer]

Re: Crossfire rough running

Thanks for all the input guys!! I'll try some of your suggestions this weekend. Sorry it took so long to reply but I've been out of town the last three days and just got back.

Monte