spark knock since new

[chuck ray]

has spark knock since the truck was new

 

[txgocartB3000]

And you didn't get it fixed under warranty?

Why do you want to fix it now?

Ray

 

[Road Angels]

knock

Theres always some one with out an answer and remark, sorry about those, 2.5 engines are prone to this , if you look in the owners manuel it says that a small amount is normal and wont hurt the engine, I used mid grade gas in mine and it nearly never knocks any more, also if it is extreme you may have had a bad sensor/controller for the egr valve from new, witch should set a cel light but doesnt always,

 

[straycat]

And you didn't get it fixed under warranty?

Why do you want to fix it now?

Ray

Was it yours new or did you get it from your dad or a friend? Just odd that it was not taken care of when new or it was nothing to worry about back then. If it runs good, then don't worry about it, Bro. A lot of Fords have a rattle in the valve train and that is nothing to worry about unless it gets really, really, really loud...lol

 

[txgocartB3000]

Road Angels - the OP provided little info so I was asking the first thing that came to mind.

Straycat worded it better than I did but the idea is the same.

And please don't ever think you have to apologize for my thoughts or actions.

If you have a problem with me then please PM me and we can clear up the confusion.

Ray

 

[chuck ray]

5 miles new mommy are daddy did not buy it for me.bless my soul I could afford to buy it cash.john champion at med center mazda was my service writer.on the way home with 11 miles on it pinging like crazy.called john he said normal.only thing they could do was something in the computer. buy the way its a 1999 mazda b2500 that I bought new for 9500 was a steal!

 

[straycat]

I bought my 99 Ranger brand new. My 4.0 has a tiny bit of valve train rattle. You really hear it mostly when I am like at an ATM drive thru window or I go to Walgreens and pickup something at the drive thru window. As I recall it has had that bit of a rattle since I bought it. Does not hurt anything and it is considered normal. It runs great and I use 87 octane gas in it.

 

[RonD]

2.5l was less prone to pinging with it's 9.1:1 compression
2.3L's were up to 9.4:1 compression
Above 9.5:1 is were regular gas(87 octane) can start to ping

Pinging on a cold engine is caused by lean fuel/air mix and spark timing being too advanced.
On warm engine a lean fuel mix
Pinging only under load, accelerating, is usually an EGR issue.

If it doesn't ping cold and only pings when under load then EGR system is at fault.

A perfect air/fuel mix will always ping, and will melt pistons and valves, which is why we don't use a perfect(on paper) fuel mix, lol.
You need to have a slightly rich mix at 14:1, which for gas engines is the "perfect" long term air/fuel mix.
And just FYI, pinging also pits the head gaskets cylinder ring, which will cause head gasket failure, if pinging is allowed to go on long term.

If you have had pinging since new then there is a problem with something.
An air leak between MAF sensor and intake valves will add enough extra air to get a 15:1 mix, since this is unmetered air computer can not compensate for it.
But once on-line(after about 5 minutes of running) the O2 sensors should see the lean exhaust and computer should richen the mix.
If computer can not richen the mix enough then it would turn on the CEL to notify you of the lean issue.

When engine is cold the computer runs a "choke mode", Open Loop, it raises the idle and runs a preset fuel/air mix that is richer, it also advances the spark timing.

If you have much less pinging when cold then fuel mix is the most likely issue.

This could be from an air leak or MAF sensor but most likely the computer is the issue, since O2 sensors are not correcting the mix.

Now the 4cyl just has the one O2 sensor for fuel/air, the 2nd O2 tests if cat convertor is working.
Maybe that O2 sensor was just a bad one from the start, maybe it tends to read rich so computer is running engine too lean.

 

[tmcalavy]

Up your octane, at the pump or with some acetone...or just live with it. I don't think advancing the timing is a good option, but used to be the only way back in the day...some Fords just like to moan and groan when working...kinda like some dames.

 

[RonD]

Up your octane, at the pump or with some acetone...or just live with it. I don't think advancing the timing is a good option, but used to be the only way back in the day...some Fords just like to moan and groan when working...kinda like some dames.

I think you mean retard the timing to prevent pinging.

 

[tmcalavy]

Yeah, you're right...been a few years since I timed a real powerplant, rebuilt a Holley carb or dribbled water into one to knock the carbon out.