89 Park Ave Ultra Ignition Issues
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.