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Diagnostic/Fault code--engine missing 900 1995

posted by  someone claiming to be Bob neumann on  Thu Jul 19 12:17 CST 2001 [RELATED]

I'm trying to track down a "miss" in my '95 964 with 90k miles. It's not real pronounced, but you "suspect" you hear it at idle, and if you rev the engine, you definitely perceive it stumble a little as it first begins to rev up. Once up to 3000-5000 rpm it's smooth. I have replaced the Oil with synthetic and performed an italian tune up, (a couple times: it's fun and it makes people stare at you ;-)), replaced the fuel filter, replaced the spark plugs and examined the wiring leading to the coil packs, (no real defects noted, just some heat discoloration on the insulation), checked the voltage (with the engine running) both at the battery terminals and farther up at the other end of the cables (Identical), and checked/cleaned the air filter. I just now followed the faq instructions to check the fuel and ignition system diagnostic codes. The ignition system wouldn't give any information, the fuel system returned a code 2-3-3. Where can I find out what a 2-3-3 means? It's not in the faq.

Anyone know why the ignition diagnostic system (Port 6) won't talk to me?

How can I troubleshoot the coil packs? My gut says it's an ignition problem. (That or compression, and I don't have a compression tester, and, quite frankly, a compression problem on this engine is more than I wish to face--I don't even want to think about it!)

Rafael mentioned checking the voltage going into the coil packs. What should it be when?

What does the distributor use as a rotation pick-up? Any way to test it?

Sorry for so many questions. I guess I'm seeking guidance on where to go from here. TIA

Bob Neumann

'95 964 90K, '89 745 140K







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    Re: Diagnostic/Fault code--engine missing 900 1995

    posted by  someone claiming to be Jim Bowers on  Fri Jul 20 04:10 CST 2001 [RELATED]

    Sorry I don't have my manual here a work so I can't check the code for you and I won't have time this week end either. If you don't have answer from someone by next week I'll get it for you then.

    The ignition base timing is from the sensor on the flywheel at the back of the engine. There is a longer space at the tooth just before TDC. Then there is a shutter wheel on the back end of a cam, I think the exhaust, to signal the ecu as to which phase the crank shaft of the engine is in for ignition.

    My manual also lists the primary and secondary resistances of the coil packs.







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    Re: Diagnostic/Fault code--engine missing 900 1995

    posted by  someone claiming to be Rafael Riverol on  Thu Jul 19 15:02 CST 2001 [RELATED]

    Hello Bob:

    I will try to answer your questions one at a time as best I can. I will cite my sources. Remember you and other Brickboarders are more knowledgeable about cars and Volvos than I am. Nonetheless, you and I share a like experiece having recently bought the same used car and now doing preventive maintenance and repairs.

    I too have experienced that slight miss and initial stumble on acceleration. I changed engine oil, ATF, PS fluid and differential oil all to Mobil 1 synthetics, changed al filters, etc. Coil packs looked absolutely brand new on my car. The local Volvo dealer charged for changing sparkplugs a month or two before I bought the car. Nonetheless, the sparkplug electrodes were dirty with heavy deposits when I checked them. Sparkplugs also had a rust like discoloration where the ceramic insulation meets the metal head. As you know, I found cooked crumbling insulation on the female connectors at the coil packs. Since you find heat discoloration at insulators, you may want to check (female) barrels for oxydation, heat discoloration, etc. You can also check for voltage drop between ignition wires, coil female connectors and male connectors on the coil packs. What information I have from ALLDATA says ignition coil primary resistance at terminals #1 and #15 is 0.5 Ohms. I do not know what voltage is suposed to be.

    ALLDATA says:

    TROUBLE CODE CONDITIONS

    If idle air trim is allowed to raise or lower air mass flow through the valve too much to maintain even idle, Diagnostic Trouble Code (DTC) 2-3-3 is set.

    SUBSTITUTE VALUES

    None

    FAULT SOURCES

    Blocked air filter or air intake

    Contact resistance in connectors

    Air leakage

    Incorrectly adjusted throttle

    Defective Idle Air Control (IAC) valve

    FAULT SYMPTOMS

    Idle too high or too low

    My Volvo 960 (1995) has two OBD I modules labeled A and B. Socket #6 is empty (no female connector) in module A. There is a female connector in socket #6 in module B. Maybe this helps.

    ALLDATA says ignition timing is 10 degrees BTDC at 750 RPM and the crankshaft position/speed sensor resistance is 200-400 Ohms. I do not know whether this helps you.

    I think that is all I can tell you. Hopefully, you will get more help from a more knowledgeable source. You may want to read experiences Joe and Roy posted at BB S90-V90 forum on July 16. I have had their problems with suspension and other things too. Best regards.






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