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Old 05-08-2013, 08:43 PM   #1
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Default 89 Park Ave Ultra Ignition Issues

Hi,
New to the site and have an issue which will be somewhat lengthy, but I will post progress and hopefully the solution / resolution for future reference. So here it goes:
1989 Buick ParkAve Ultra w/3800 LN3. Started running rough (at all rpm’*) and SES light was doing the on again / off again thing. OBD1 “blinky” codes were 13, 21, 39 & 41. So I replaced O2 sensor the Camshaft Position Sensor and the Camshaft Position Sensor Interrupter Magnet. Result-SES light no longer comes on, but still have a code 21 (TPS high voltage), and engine runs terrible (no power / acceleration – misses and “coughs” at all rpms) Feels like a plugged CAT Conv. but I replaced less than 3 yrs ago (<20K Mi.) Also has brand new Autolite plugs and wires. So, I feel like I’ve got it narrowed down to just about anything in the secondary ignition system…lol (ie. Ign coil, ICM, MAF Sensor, TPS, ERG, Fuel Pump, etc.)
I’ve borrowed a SnapOn MODIS scanner, but have never used one before and from what reading I’ve done I’m not sure it’* gonna be of much help since car is OBD1.
Any suggestions / advice would be appreciated, I’m gonna hook up scanner tomorrow so I’ll be able to post any useful data if it helps.

Thanks
MW
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Old 05-08-2013, 11:19 PM   #2
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What have you done to address the TPS code? Did you check the sensor and wiring? That alone can make the car run awful.
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Old 05-09-2013, 10:20 AM   #3
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Test the throttle position sensor as follows:

https://www.gmforum.com/trouble-shoo...sensor-279319/
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Old 05-09-2013, 03:25 PM   #4
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I was hoping the MODIS scanner would provide me with some additional info on the TPS, but I've just discovered I am lacking the 12V Lighter Power Accessory for the GM-1 (OBD1) communications adapter. Electrical systems and their diagnostics are definately not my strong suit, but I'll get a multimeter and run the test on TPS if I have to. Debating on whether to spend a few extra bucks on the meter and get one with frequency testing capability in case I need to test MAF sensor. Again I had hoped scanner would check that too.
I thought I might drill some holes in the exhaust pipe on supply side of CAT to see if relieving some backpressure (if CAT is clogged) helps any. I thought this would be better than pulling the O2 sensor.
Thanks guys ! I'll post updates with progress. Any tips / suggestions, question of my sanity is surely welcome.
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