Runs fine, let it sit for 20min then start & it runs rough & PO302 pops up. Turn it off let cool down for awhile & then its fine. Replaced coil, plugs & wires and fuel filter. No overheating, temp gauge is good. Could it a intake manifold gasket leak or bad fuel injector? Only happens after driving in traffic on hot day, runs fine, shut it off for 20min then start up & rough idle & PO302 code.
Ford Q&AAsk Your Question
1996 Ford Ranger Question: After driving in traffic on a hot day it runs rough and PO302 code comes up.
pushrod August 25, 2013, 11:02Master
Try some injector cleaner with Chevron Techron. If that dont help after driving awhile, a week or so, have the injectors professionally cleaned.
Possible vacuum leak but not as likely as an injector problem. Since you have installed premium ignition parts, i'm sure (?)
ReplyRanger Smith, August 31, 2013, 08:53Rookie
I belive that solved the trick. I added a bottle of Zmax to the oil (suppose to clean the internals of the motor) , then added a bottle of Lucas fuel injector to the tank and filled up with 91 octane at Shell, once i got down to half a tank i refilled with 91 octane and added another bottle of injector cleaner. Then drove up to the Sequouas (235 miles) at 70-75 mph. Ran great had no problems plus i got around 24-25 mpg, never got that good ever.
Replypushrod, August 31, 2013, 15:02Master
Thanks for letting us know!
Answer #2Greg's Orange Auto (13388 Answers) , Orange, CA - (714) 361-9386globalhelper August 26, 2013, 06:40Master
TRY SAEFORM INTAKE CLEANER YOU CAN BUY IT AT ANY PARTS STORE