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1990 chevy cavalier 2.2L tbfi
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yoyodoc4
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May 13, 2011, 9:08 AM
Post #1 of 12
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1990 chevy cavalier 2.2L tbfi
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I have an issue with my wife's car a[1990 Chevy Cavalier,2.2L tbfi with 100,500 miles] it has begun to drop cylinders 1 and 4 intermitantly, I had the ignition control module tested and it passed, so I replaced the coil pack for cyl's 1 and 4.
the problem persists,Sometimes it drives fine sometimes I lose 1&4 cyls. also the E.C.M. does not see a request for A/C This just began after the spark issue...... (this and the right turn signal indicator being dimly lit when signal is Off and Headlights are on?) these 3 issues began in the last 5 days. I checked all harness connectors, the E.C.M. has no trouble codes...before this the car worked fine.....Any Help would be greatly appreciated. P.S. I held a California Unlimited Smog Inspectors lic. in the 90,s so I know something about cars Thanks, Roy
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Hammer Time
Ultimate Carjunky
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May 13, 2011, 9:34 AM
Post #2 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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You have an intermittent issue so have the component tested isn't going to find anything. You could have issues with the ECM itself or even the ignition module but it's going to be very difficult to confirm with the nature of the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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May 13, 2011, 9:38 AM
Post #3 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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Not sure why it's picking on coil to 1+4? The A/C is dependant on a reasonable static pressure just sitting there about equal to temp in F. You never know when a total loss could happen with A/C of it's charge and wouldn't engage with a low static pressure.
All this at once is curious? Turn signal may be a socket for the bulbs on that side or bulb(s) themselves among other things. Right now I can't think of ONE common thing to cause three issues all at once so it may be just luck.
Recheck connections again is about all I can suggest for right now. There should be a rubble like block with tons of wires on firewall where tons of things are controlled thru. Rare for failures but have found that before. That might be of some fault but I don't think that could make one coil pack quit. Damn intermittent crap will drive anyone nuts!
T
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yoyodoc4
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May 13, 2011, 9:40 AM
Post #4 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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Thank You HammerTime,
I realize the issue is deep ,However I want to suspect the E.C.M. seeing the A/C is not controlled by the ignition module?
Thanks Again, Roy
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yoyodoc4
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May 13, 2011, 9:44 AM
Post #5 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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Thanks Tom,
the turn signal was a bad connector on the wiring at the bulb,The A/C Works fine when I jumper the green wire to +12v and stops when I remove the jumper,is there a common ground or relay for a/c and ignition module?
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Tom Greenleaf
Ultimate Carjunky
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May 13, 2011, 10:12 AM
Post #6 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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A/C only for now: I think green wire should always have 12v with A/C requested and won't send on current to compressor unless there's enough pressure on low side. It might work and even cool but still be low which doesn't explain the low switch not having current on one side. Thing MIGHT be being told not to come on via some other common denominator for that and no spark (apparently) to 1+4 unless computer knows that when car isn't running well to give up on A/C? Not sure on that for this car at the age,
T
PS: Thought you'd find a problem at a socket for the dim signal indicator. If not totally fixed now you can get new sockets at like NAPA at least and nicely splice in wires,
T
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Hammer Time
Ultimate Carjunky
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May 13, 2011, 10:30 AM
Post #7 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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Check for A/C request power at the Dk Blue wire at pin 2 of the C2 connector at the PCM. If none found, trace it back through the 2 pressure switches.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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May 13, 2011, 12:24 PM
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Re: 1990 chevy cavalier 2.2L tbfi
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Tell me Hammer - would this have two pressure switches for a 1990? That and why? Just for my own info or do you mean the one sensing compressor temp?
T
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Hammer Time
Ultimate Carjunky
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May 13, 2011, 1:46 PM
Post #9 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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One high, one low in series between control head and relay and PCM.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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May 13, 2011, 2:20 PM
Post #10 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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OK - thanks. I just don't recall any high pressure switches OE on R-12 vehicles which this was in 1990??
Tom
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yoyodoc4
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May 16, 2011, 3:46 AM
Post #11 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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Having a devil of a time locating that high side pressure switch or a port on the high side?
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Hammer Time
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May 16, 2011, 4:14 AM
Post #12 of 12
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Re: 1990 chevy cavalier 2.2L tbfi
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The switch should be in a line, right next to the alternator.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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