Have a 1998 Rav4 starts and runs good but will be chug two or three times and then it will run fine for awhile now it is quitting once and awhile while your driving down the road, but starts right back up and runs fine for awhile. would this possibly be a fuel filter or spark plug or wire.
Country: United StatesMake: ToyotaModel: RAV4Year: 1998
It was acting up last yr and I changed out the spark plugs and it seem to fix the problem but now its back and it is quitting more often. It is not showing a code though
HelloThis could be a wiring issue as things tend to expand when hot and its possible a poor or partial electrical connection is being pushed apart on one of the major sensors so check the connection plug and wiring to the following;Airflow meterCrank position sensorO2 sensorThrottle position sensorAlso worth checking the connections to the fuel pump for the same reason - unplug each in turn and give them a good squirt of switch / contact cleaner - Not WD40and also unplug and inspect the main power relays and fuses for signs of overheating or corroded terminals - so the ones for the ECU and the fuel pumpAnd also unplug the wiring loom connections in the engine bay one at time and inspect for corroded or recessed pins.Check the resistance of the spark plug leads ( 13-15Kohm / metre) and replace if any doubt or high resistance - Also replace the spark plugs if any of them fail this checklist:http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.aspAlso its worth checking that the electric pump that feeds the injectors is working correctly, it should run for a few seconds then switch off when you first turn the ignition on. If the connections to this are corroded or damaged then the pump could stop at any time. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse, ideally measure the voltage at the pump and check its getting 12VAlso check for exhaust leaks before the o2 sensor as if this has been experiencing an exhaust leak then it will have been running very rich as the sensor will see the extra air pulled in as fresh / lean fuelling and be adding fuel to compensate.this can lead to catalyst failure as the extra fuel can re-light inside and melt the catalystThe best way to find an exhaust leak is to run the engine from cold and feel around the exhaust joints with your bare hands - you'll have about 30 seconds before it all gets too hot and you should feel any escaping gas blowing over your fingers
BEng, Repaired my own cars and others for 20 years, worked in Formula 1 for 10 years