97grandam w/history coilhousing problems.runs rough, fan stays on
Trouble codes 1) po300-random/multi cylinder misfires; 2) po440-evap emission control system malfunction; .3) po502-vehical speed sensor A circuit low input... Replaced housing but not coils themselves.. boots not changed but looked fine.. plugs new.. Still runs rough, fan always on even when just started, idles low then sometimes high. engine temperature light never gets to previous temp levels. could this be a ignition coil problem as usual or maybe a sensor problem? I dont have many tools or the knowledge to do alot of testing.
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Feb 5, 2010 - Uploaded by Scotty Kilmer
Scotty Kilmer, mechanic for the last 46 years and counting, shows how to fix your car if the check engine light ...
(02 sensor )po153=bank 2 sensor 1 slow response,(o2 sensor) po154 =bank 2 sensor 1 stays centered not rich not lean, po300 = multiple cylinder misfire ,po444 = evap purge selonoid circuit,open or shorted the one that is a concern is evap on the others may clear after you fix evap code.
Air leak in the intake manifold, or in the EGR or PCV systemBase engine problem affecting two or more cylindersCMP or CKP sensor signals erratic or out of phaseEGR valve stuck open, or EVAP purge system has failedFuel delivery component fault that affects more than 1 cylinder (i.e., contaminated, dirty or sticking fuel injectors)Ignition system problem affecting two or more cylindersVehicle driven while quite low or until it ran out of fuel
See also: P0300 diagnostic code @ OBD-Codes.com Possible Causes: Fuel injectors, related wiring, sensors and computer issues Running out of gas, or poor fuel quality Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine Incorrect Fuel Pressure EGR system concerns: leaking EGR valve or restricted ports Base engine concerns: low compression, valve train problems and timing issues Ignition system concerns including, but not limited to: Faulty spark plugs Faulty coil or related wiring Ignition module or related wiring issues Ignition related sensor faults or wiring issues
Hello your po135 is o2 sensor bank 1 your po141 is O2 sensor bank 1 sensor 2 and your pO300 is random multiple cylinder misfire these problems are your oxygen sensors and engine misfire pO300 is you engine missing o2 sensors are switches in the exhaust system the engine misfires are the engines cylinders missing.
This might help. It looks like you O2 sencor had gone bad or the signal has and causing multiple mis fire. according to your codes.
PO171 System too Lean (Bank 1 PO174 System too Lean (Bank 2) PO300 Random/Multiple Cylinder Misfire Detected Causes of PO300 Fuel injectors, related wiring, sensors and computer issues Running out of gas, or poor fuel quality Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine Incorrect Fuel Pressure EGR system concerns I'ld start with chaning the O2 sensors first but sheck for bad wire connection. Hope this helps and good luck