Ford 302 FI issue

KInda hard to hide the Ohio. Everyone down here knows we are from Ohio or michigan when we open our mouths.

john

ouch ouch and one more time ouch,

Tim, it looks like they did a whole lot of other stuff too.

I wonder how the EFI system knew a cylinder wasn't firing? Would the knock sensor have picked that up? I doubt that thing has individual coils for each cylinder so with a distributor I don't see how the engine could tell what cylinder was not firing. I'm just curious as to how that would have thrown a code for you EFI pros out there.

M3Fan wrote: Tim, it looks like they did a whole lot of other stuff too. I wonder how the EFI system knew a cylinder wasn't firing?

Im not sure how involved changing the idler pully and drive belt are, but adding a bottle of injector cleaner and changing the oil are not high dollar repairs.

Im not sure which sensors are the ones that detect spark plug misfires. Could be the KS, Id be curious to know as well. Youre right- they may not be able to pinpoint the exact cylinder, depending on the ignition system. Replacing all the plugs is a pretty easy first step if there are no obviously damaged wires, etc, though.

It did not know, and does not care if one or all are firing. I would say the O2 sensor picked up the high fuel reading, too rich, and could not lean out the mixture.
Then it set the code,I wonder about the plug not firing and the mileage on them.Ever part has a service life ,even spark plugs do not live forever....
What ever happened to a simple plug change?Cheap and easy to do , no scanner needed and would have saved you several dollars.But there goes my redneck thinking again,SORRY..............

boat dr wrote: I would say the O2 sensor picked up the high fuel reading, too rich, and could not lean out the mixture.

Great call. Should have thought of that one.

Sorry Joe , but do not buy that story.
If the plug was bad there was still voltage output at the coil, so there was also a pulse at the injector.You get fuel but no spark.
The O2 sensor will see this as a over rich condition, this will set a code. Not firing the spark plug will not.

You don't have to buy it, it is the facts. You can go to the SAE, Carb, or EPA sites to read the standards and regulations. Auto manufacturers are required by law to be able to sense cylinder specific misfire under all loading and operating conditions have been since 96 although they were allowed some phase in time between 96 and 2000. It doesn't matter if the coil sparks or not or if the injector fires or not... if you dont get an ignition the computer is required to sense it and issue a code after a number of repeat occurances. The oxygen sensor is not fast enough to tell in real time what cylinder had the problem but the crank angle sensor (and others) is and does. If it records multiple occurances over a 200 rpm sample it must kick out an MIS code. There are some allowances for when they can disable the system

The good news for marine manufacturers is that so far the 2009 carb standard makes cylinder misfire monitoring optional as long as it is not proven required to protect the catalyst, and if it is required to protect the catalyst it is still not to be required to be cylinder specific for marine use which will save some development and hardware money.

I'll vouge for the mis fire on one cylinder, i had a rough running VW cabrio and the light was on, it was a normal, cap, plugs and wires ignition, no coil packs. my scanner told me it was a misfire on the number one cylinder, the customer replaced the plugs and cap a week before so i knew those two were not the problem. put a set of wires on and cured the problem, ...I read Joe's post and have a feeling he is 100%, because i dont know how it picked up the mis-fire on number 1 and i was curious as hell on how it did it.
the scanner i purchased made life alot easier...now i too am a automotive technician lol   eric

Here is a question i must ask and hopefully someone will know because i dont, I am wondering if i can use this scanner OTC Genisys, on boats, of course im talking about late style with EFI and so on.....do they have a obdII port to scan them? i would think they do and i think i can use the Global scan feature on the scanner. its hard to believe the information this scanner tells you,

Don't feel too bad ken that idler pulley would have seized and left you dead on the side of the road at some point and maybe your getting a half mpg better with the clean injectors... with oil at 100 a barrel that would pay for it all...

Nautique2001 wrote: Oh, man, sounds like I got the dry carrot here. Tim, can I have you for all my needs? I'm trusting. I have to say, my *uck is very strong. I got the shaft, but feeling good. A whore I wish I was more of. Ken

Your truck is fixed, and you're on the road. Now drive it to a Chevy dealer and trade that thing in!

Thanks, Brad. The good news is that it was fixable. At least I didn't need a new engine. We're running like a top again.

Happy New Year, Brad. Lost Lake in 4 months?

Ken

Hey Brad...I am back inside now. It was 27 out this morning when we headed out to work. Everyone down here is in a panic. Does feel cold tho...windy too. We just ain't used to this anymore. Warmer by the weekend tho.

john

Believe me...you get spoiled soon. We enjoy the snow...while we watch it on the tv. Snow is always the first item on the evening news.

Next time you visit your folks in Naples you gotta roll thru Lake Wales on your way down.

john