stxf150 off roading

That's weird tht it is the same noise thing it makesand it's not exhaust leak

Brandon587

I haven't completely eliminated the manifold leaking from being cracked or leaking where it bolts to the block, seems like I remember reading it not having gaskets where it bolts to the block. Id just like to eliminate it being my heads and transmission.

Brandon587

Just read this......."Clatter can be caused by a LOT of factors, or any combination: fuel quality, ignition timing, valve timing, combustion chamber deposits, spark plug design, air-fuel ratio, oil pressure at the lifters, exhaust restriction, exhaust leak, vacuum leak, altitude, engine tune, sensor/actuator malfunction/aging, overheating, insufficient EGR, etc." Thats alot to check, so I guess Ill start tomorrow with cleaning the egr. DOes my truck have two, one for each manifold? And Ill still check to see if exhaust is leaking at manifolds, because on the way home I thought I might have heard something, but could be imagining it.

DIY

Tips from Big Byrd 70 (ex Ford tech):
Check for:
1. carbon track in distributor cap
2. poorly grounded coil
3. poorly grounded fuel pressure regulator (located on the D/S wheel well the grey thing with big heat sink)
4. corroded coil tower

DIY tip: Clean the ground sources. Remove corrosion using Brake Clean or Electrical contact cleaner [or] Replace parts as necessary

Brandon587

WIll try, also going to clean my egr. Tried cleaning maf, doubted it would work, and it didnt. But the truck runs noticeably better and My exhaust doesnt smell as rich. So is the problem mostly likely caused by ignition problems or fuel problems?

DIY

3 out of 4 chances it is electrical.

Brandon587

I'd be so feakin happy if it was, much better than gummed up heads or worn timing chain, which I fear it is. But obviously start easy and work from there. How can bad electrical connections cause what sounds like lifters rattling, I;d just like to understand, not just know.

DIY

Bad grounding and corroded electrical connections are the 2 most common causes of electrics related issues. High resistance results in reduced voltage or amperage delivery to sensors and the ecu. I first thought it might be a bad knock sensor until I saw Big Byrd 70's post on a different forum website. His tips came from practical experience. Mine came from past experience.

Brandon587

So a fuel pressure regulater not working properly and cause a wrong fuel air ratio and cause valves to chatter? Or bad spark can cause it not to burn all the gas and somehow cause valve chatter and or noisy lifters?

Scraptor

No, but they could cause a miss fire condition, or detonation, which SOUND LIKE, valve chatter.