Yes, the fuel pressure is slightly out of limits and could cause a little rich running conditions.
November, 25, 2012 AT 4:41 AM
Okay, I already to replaced a new fuel pressure regulator. And change all new valve stem seal, it no more blue smoke from tail-pipe. It look pretty good, but the engine still funny misfire something wrong and like to drive on high way really smooth. Most time to stop traffic light, it feel something weird misfire of little stall but engine still not stalling at yet and check engine light never show anything as possible, nothing. I wonder why? I already to remove engine head from block for change the valve stem and cleaning all the block and head, also valve clean too.
November, 25, 2012 AT 9:25 PM
Misfiring and erratic idling are 2 diffferent symptoms and I do not know which is the exact problem, can you reconfirm?
November, 26, 2012 AT 5:26 AM
No, it not erratic idling. Right now and still misfire something go on. It like no misfire few second till misfire again somtime after stop at traffic light. Okay, First I start the cold engine go up a little bit 1000 rpm till go down lower at 800 rpm so short time, (3 second warm start). So, I don't see anything no more smoke from tail-pipe, because I rebuild new valve stem look nice. Anyway, I drive the car fast to go so good about 1 mile and then stop car at parking lot, these engine seem misfire again, it sound misfire so many time. I do believe the fuel injector problem. Not sure, I never replace all fuel injector, only clean and test 12 voltage battery connetion at spray gas pressure seem look good and test ohm meter, read measure the resistance of each injector should good. It funny man.
November, 26, 2012 AT 3:55 PM
Recheck the spark plug and wires. Have the wires ohmed out and see if any has a problem. Ensure the wires are tight and snug when plugged in.
November, 26, 2012 AT 11:10 PM
Well, I check many times with whole new sparks, distribution body complete replaced, and spark wire change too. All ignition module system too. I did pull off each spark wire from engine run idle sound different missing spark for test spark outside. So, it normal to put back on each test spark. This time, I order the new Equus Products Digital Timing Light gun from Sears. I will set timing right. That because I changed the new distribution body without set timing last six mouth ago. Maybe timing set pretty off little bit degrees. I let you know. If these timing set right or not, then I will check fuel injector each test. Do you think I have to find how I am going to do with fuel injector test with contect signal or flashing light something?
November, 27, 2012 AT 3:48 PM
Incorrect ignition timing can result in erratic idling as if the engine is misfiring. I don't think you need to test the ignition signals because the signals are good based on what you have. If it is a fault with the injectors, it most probably is the injector is either clogged and sending too little fuel or it is not closong correctly causing excessive fuel to be dumped in.
However your description seems to point to ignition sparks rather than fuel problem.
December, 2, 2012 AT 10:01 PM
All right, I check a fuel injector connection plug out of each for test to start engine idle go missing and rough cylinder, count fuel #1 rough, #2 misfire, #3 rough, #4 rough idle. It look seem #2 misfire as same like before that. I think #2 fuel injector not working right, when I plug out #2 fuel connection plug go misfire so far, random misfire. I'm no experience be mechanic better. Not sure, it that reason misfire as possible.
December, 3, 2012 AT 2:23 PM
Ok, I found out that not fuel injector and ignition too, both still good. And engine light does not of any code at yet, it normal. I believe the engine head's problem, bad head possible. It really misfire, that I rise a feeling the engine's 1,500 rpm with my foot panel at parking a lot. Wow, I didn't know not to drive test like that, because it so smooth on the road. Park a lot it different feel engine misfire.
December, 3, 2012 AT 7:41 PM
Have you tested the compression?
Check the valve clearances.
Check the EGR, try disconnecting the vacuum of the EGR valve and plugging it.