Hello I’m trying to help my brother fix his s2k that’s been having rough idle and shaking has all 4 misfires and a random misfire Honda code. He’s read the forums and so have all and can’t seem to fix it. So far we have done as followed:

new plugs
new coils
valve adjustment
Valve cover gasket
spark plug seals
map Sensor

haven’t messed with anything fuel related he says it always had a shaking idle but didn’t get misfires till he had to put low grade gas since all premium was gone during hurricane

Maybe camshaft positioning sensor? Or egr valve related? He says the spark plugs get dark or maybe something in the fuel pump like the sock? Or injectors? I don’t want to have him just spend money on stuff that isn’t necessary

TIA,
Cesar

 

Also the tct been done too

 

A friend had a similar issue, and it turned out to be a loose connection to the MAP Sensor.
Honda makes a solution for it, a Zip-tie Hood that secures the plug to the sensor better.

Hopefully that's all your car needs too;

 

thank you for the reply we just used a zip tie to make it tight to see if it worked. We cleared the codes and the misfires came back still. It started good but then a whistle goes off kinda like a blow off valve and then the check engine light blinks for multiple random misfires

 

https://youtube.com/shorts/hcfEel9pEE4?feature=share

here is a short video of it idling

 

What is that metallic sound coming from?
Kind of sounds like the timing chain/tensioner (?)
Could a stretched chain and/or failing tensioner cause the timing to be off enough to cause misfiring (?)

< sorry, just guessing at this point >

 

Hello I believe it’s the black heat shield that’s by the exhaust manifold the back is loose so it shakes when he it’s dying down. My brother says he has replaced the TCT already

 

Whew, well that's a relief at least

 

yessir thank you though