90 si stock engine light knocking noise only during hot weather and after hard driving and cel comes on when I check for codes there are none. Engine smokes a little bit under wot but seems to run strong still. it also sometimes idles below 600 then goes back up to normal. I'm not driving the car anymore but I would like to know if its a big problem or timing related belt seems to be more loose the usuall and I was thinking it could have jumped timing. I don't know if this is even possible. Thanks

 

my 91 si also makes a light knock sound. Most likely nothing to worry about, could be an injector getting a bit noisy, could be one or two valve lifters just a little bit out of spec, could be one spark plug hitting just a little bit early. Nothing that's gonna cause damage (least that's what the Honda specialists told me)

very unlikely that your engine skipped a timing belt tooth. If that happened you'd feel a noticable power loss at some point in your power band (depending on which way it skipped). The smoking at WOT is probably valve guide and piston ring wear letting just a little bit of oil past the seal. To be expected of a high-miles, well-worn Honda engine. Try putting some Lucas Oil in your oil next time you do an oil change. If it's burning more than a quart of oil in 500 miles, put in one whole quart of Lucas oil, and if it's less than that, just put in a half quart of Lucas Oil. You can get it at Napa Auto Parts, and I'm sure lots of other parts stores, depending on which stores you have in your area.

 

yea man i think you have a couple of problems there...

another thing you mentioned that AwwsChwA left out was the idle movement that could be your idle air controler

and for the code jumping are you using a scan tool or just jumping the wires...
cause if your using a scan tool it will tell you the codes and sometimes say no code found...
but if your jumping the wires i don't know what it would do...
are you jumping them right and what does it do if so...

 

also the knocking could be a number of things...

1. it could just be the valves hopefully
2. it could be that your low on oil and if you add some it goes away
3. it could be that you spun a bearing

so it can be a number of things

like if you spun the bearing it would also cause the check engine light

and for the smoke like AwwsChwA said its probly your pistion rings do what he said about that lucas oil... it can't hurt to try to help it...

 

im new to the block i have 83 prelude es1 side draft 1.8 i just done anb/ head job and i was informed that you need to readjust the rocker assembly when removing the cam and they say to adjust them every 45 thousand mi::::::::::::::::::::::::::::

 

and yes, to answer C-C, you do need to adjust valve lash and make sure that the cam is timed with the proper cylinder when replacing a cam. Valve lash on Honda engines *should* be set every 15,000 miles, but you can get away with 30,000 miles without any major noise or power loss.

 

I wasn't aware I had to jump any wires to check codes. I was just looking for the flashes. 90 si

 

I had the timing checked and set again and there is no noise seems back to normal but I will probably still swap it out. I'm selling my other hatch to my bro so I can finance a new motor.