funky idle after timing belt install

[dy5]

it seemed like the teeth were all lined up, but it hasnt run for like a month, could it just be that it is running for the first time, how do i check the timing? my pocketlogger reads 18-21 degrees of timing. could my base timing be off and if so what would happen what would it sound like, it is kinda camming.

 

[Mitsuturbo]

most common mistake with timing belt installs is that the oil pump gear is 360 deg out of whack.. i know 360 seems like it should be fine... but there is a balance shaft back behind the oil pump that rotates 1/2 for every turn of the oil pump gear. If you rotate the oil pump gear and it wants to fall AWAY from the mark, then it is out of whack... if it wants to fall into place and line up, then it's right.

your car would run rough.. i do mean ROUGH.. it will vibrate like a bi*** if this is the case....

also.. there is a bolt in the block on a machined flat surface, above the axle.. if you pull it, and stick a 6" long 1/4" drive extension in there.. it should go straight in.. if it does not then it's outta whack.. this hole is to set the timing right.. just a way of idiotproofing things... when the balance shaft lobe is up, you cannot get the extension in.. when it's down (as it should be) then you can insert it.. and it keeps the shaft from turning. Keep in mind that all the marks line up only after 6 complete revolutions of the crankshaft.. so just lining up at TDC will not suffice.. you have to be able to see both balance shaft marks.

Hope that's your problem, cause it's an easy (albeit time consuming) fix.

 

[dy5]

not like it is shaking, it is just sounding like it is caming, but i think i kept everything pretty straight and didnt move it to much like 360 degree's, when installing it. i didnt use the screw driver method, and i didnt rotate 6 times, i just rotated the crank shaft until the came gear dowels were up and all the marks were lined up, and that is TDC. right? could i have done something wrong like have been off a tooth?

 

[turboholic]

-Did you set the base timing with a light?

 

[jott5555]

bro did u floow the instructions exactally i had a shop do mine they didnt set the timeing right when the tensioner relaxed the belt skipped teethe it ran fine for 2 mons until it relaxed, AND what BENT valves, soo, make sure u did it right, u have to pin the tensioner then do the belt then release it and set the timing, just a idea bro

 

[dy5]

i did pin the tensioner, i did it right to the best of my knowledge and vfaq, and the book. no i didnt set it with a light. im going to go get one tomorrow to figure out my base timing.

 

[Mitsuturbo]

just because the marks are lined up on everything does NOT mean the oil pump's balance shaft is in line..

btw.. what is caming?

 

[dy5]

its my explanation of cams

 

[Mitsuturbo]

im confused. caming is not a term i am familiar with... and your explanation is leaving a lot to be desired.

 

[dy5]

you know when you buy aftermarket cams. they leave you with a particular idle and sound that is what caming is referred to as.

 

[Sartuche24]

What he's talking about his like the V8 guys that bigger cams on there cars and it gives it that sound that it almost wants to die at idle. You can do it to our cars to I just used the V8 as a example since a lot of people could understand that.

 

[dsmpartshunter]

It sounds to me that you did not use a straight edge when you lined up your cam marks. Visually, it will look like the marks are on each other but you MUST make sure the marks come together flush with the machined surface of the head - use a ruler. If you don't, this will amount to a tooth off and will run like crap but not cause valves smacking into pistons (not yet at least).

This is a very common problem if you haven't done a belt replacement along with having the oil pump out of sync and the tensioner set incorrectly.

 

[lowavenger96]

www.vfaq.com.................

 

[dy5]

Originally posted by lowavenger96
www.vfaq.com.................

WOW LOwavenger, thanks for the info.