caddypete Posted October 8, 2009 Report Share Posted October 8, 2009 Been trying to figure out my hesataion and p300 misfire code for awhile. Codes would not help, I would have p300 random misfire,lean bank1,low voltage, high voltage heated sensor bank ,1suffidient switching bank1 just depended on what it felt like throwing that day or it seemed to me. I would get high and low voltage codes at the same time being current. Changed the sensor same problem,switched bank 1 and 2 sensors same problem. replaced all injectors both coil packs (got a deal on Ebay off a low mileage wrecked STS) cleaned EGR valve, changed plugs, cleaned TB. nothing seemed to work. After giving some thought I know it didn't matter if car was hot or cold, and if I would floor it the miss would go away once it hit higher rpms. If I was in traffic I would just depress the pedal and eventually it would catch because flooring it wasn't a option. So I thought the throttle position sensor makes the most sense to me even though I never got a code for it.So today I replaced the throttle position sensor. Not having much faith that was the problem, I was pleasantly surprised the car performed much better on the short ride I took it on. It still had a slight hesatation but cleared up without being floored, a few seconds of SES light flashing for misfire cleared itself up. Usually it would keep up these symptoms till I mashed on the pedal. The true test will be tomorrow when I take it to work. Hopefully those few seconds of acting up was just the computer readjusting. I have my fingers crossed because trying to get it from acting up and flooring it is not going to work well once the snow hits. Link to comment Share on other sites More sharing options...
adallak Posted October 8, 2009 Report Share Posted October 8, 2009 Hopefully it will work. Keep updating! Can you test the old TPS by attaching ohmmetr and watching how the resistance changes? Any jumps/gaps will clearly indicate faulty TPS because it is basically a varistor. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
caddypete Posted October 8, 2009 Author Report Share Posted October 8, 2009 Yes I tried to test the old TPS but it was hard to tell if it was the sensor or me losing contact with the prong that caused the needle to show no continuity. I gave up trying because it didn't make a difference to me at the moment because I already installed the new one and had several tasks yet to finish today. But I will post back after my 45 mile round trip tomorrow where I get both city and freeway driving Link to comment Share on other sites More sharing options...
caddypete Posted October 9, 2009 Author Report Share Posted October 9, 2009 Nope that was not it. It does not act up as bad as before but there is still some hesatation and missing. I will eventually have to give up and take it to the dealer. With any luck theywill figure it out. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 9, 2009 Report Share Posted October 9, 2009 Its interesting that a TPS was considered in this analysis, see this article http://www.autotap.com/Articles/Engine_Misfire_UC.html Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
caddypete Posted October 9, 2009 Author Report Share Posted October 9, 2009 Its interesting that a TPS was considered in this analysis, see this article http://www.autotap.com/Articles/Engine_Misfire_UC.html That was an interesting article. Originally at one time I would get a lean bank one code and I replaced the intake gaskets and while doing so discovered there was a tear in the boot that connects the intake to TB which was also replaced and also the crank position sensors. Not to mention changing out the PCM with a junk yard one and programmed by the dealer. One day I will get this thing fixed. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 9, 2009 Report Share Posted October 9, 2009 Here are a couple more articles to review http://www.autotap.com/Articles/Analyzing_...n_Misfires.html http://www.autotap.com/Articles/Diagnosing_Misfires.html I dont want to freak you out but, my Deville is currently parked. I get misfires and I am sure I have a bad head gasket. In the beginning I was getting misfires with little or no overheating or coolant loss. How did your plugs look? How are your temps Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
caddypete Posted October 10, 2009 Author Report Share Posted October 10, 2009 The temp stays within normal range and I don't lose any coolant. Today i did get a p0101 code, thats a new one for me, "mass air flow sensor performance" have not changed that yet. The only code that does come up consistent is p1133 Insufficient Switching Bank 1 Sensor 1 and U1152 - Loss of Data HCM and P1545 - Air Conditioning (A/C) Clutch Relay Control Circuit the last two are due to my air conditioner being disconnected I would hope, because thats what I have been assuming. Maybe I just have a electrical demon somewhere thats just going to drive me nuts. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 10, 2009 Report Share Posted October 10, 2009 Definately run down that P1133, an O2 sensor problem like that could be the cause Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
caddypete Posted October 11, 2009 Author Report Share Posted October 11, 2009 Today I went out and let my Caddy run and ran thru the codes again p1133 insufficient switching bank 1 cleared that ,revved it when thru the gears came up with p0130 closed loop performance bank 1, cleared that shut off car. Restarted it no codes ran it for awhile pulled codes p0134insufficient switching bank 1 cleared that ran it some more finally got a code p0327 knock sensor low voltage. Now most point to ther o2 sensor bank1 even though thats the thrid one in there the codes are not the same. Took the PCM out and used contact cleaner on all pins and connectors. I also noticed the holder for the PCM had water in it, not inside the box itself but the holder. where I took out the little plastic plug and let the water drain. I took my car for a ride to get dog food and gas. It did not act up terribly bad, but when the SES light came on pulled codes and it had p0300 random misfire as history, I cleared it. Drove for awhile and pulled codes had p0134 insufficient switching bank 1 by the time it cycled thru all the codes and came back to" pcm?" The code was gone and did not show up as history. Does that make sense? Aside from that it ran pretty well and averaged 19.7 mpg and that was on rural roads mostly hilly, I usually dont reach that avg until my way home from work where it 's last miles were freeway to work and the first miles were also freeway on my way home. Link to comment Share on other sites More sharing options...
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