97 GSX with G4CS swap DD timing belt thrown & timing issues

[gyd23]

My name is Gydeon, i am an F-15 Crew Chief in the USAF, and on March 12, 2011 I bought my first DSM - A 1997 Mitsubishi Eclipse GSX
:thumb:

now there was only 3 issues with the body of the car when i bought it
1. the driver side side marker was gone, "magically" fell out.
2. the clearcoat is fading on top, and some slight dings/chips here and there on the car.
3. this fairly big ding on the fender:

so the very first thing and pretty much only thing i did so far was pick up some smoke side markers for it..

So after i bought this car with a fresh engine in it (around 20 miles on it just from putting a temporary pre-lim tune on it) and having it un-tuned I planned to baby it untill i hit at least 500 miles and got a good tune done on it. (yes i know 500 miles isn't sufficient enough for a break in but this engine was only taken apart for the rods & crank to be replaced so it was all already broken in other than those.) and right about the 250 mile mark on about the 3rd day I noticed the timing belt doing this:

I don't know if you all can tell but it started walking itself towards the outside of the cam gears.. oh so very slightly, since i haven't been around 4 cyl more specifically this engine long enough to know if that was ok or not and briefly looking over the timing system that i could see, like the tensioner, making sure its all aligned and seeing nothing abnormal i drove on.
At almost the 400 mile mark i was almost home from working with my recruiter and i started hearing a slapping noise under the hood and immediately after a loud BANG (like a balloon popping) OMG hdamn:

Turns out i threw the timing belt, while partially shredding it, and i knew for sure judging by the timing ^^.. that i threw valves, and was just hoping that my pistons were OK. So i took everything apart, i found out what was wrong, and also what went wrong.

Yes i know that post isn't supposed to come out of the Motor Mount bracket. So i consulted the guy i bought the car from and unfortunately he didn't know of this, because frankly he didn't have the car long enough to notice this fault. But someone before him had purposely pressed this pin out, why i don't know but they did and it eventually walked itself back out. He told me to go find a bracket somewhere and that any 1G bracket will work, turns out a 1G bracket won't work due to the motor mount bolt holes, so i took my bracket that had broke up to a small engine repair shop that i am familiar with and had him pull the post out about 1/16 and put a nice weld bead on the back of it and smooth it out, and i got a 1/16 thick washer to put around the post and under the normal washer to compensate for the gap the arm would make. Worked out perfect.
I then bought new valves, got new ones put in etc. and threw it back together. Something i didn't know about at the time was that the CAS controls ignin timing and i just kind of bolted it back on where it looked like it was before. (not so good of an idea.) but i started her up and she ran just like before. Still wouldn't idle due to being un-tuned and not having an IAC. but all was good, so i drove it around for a couple more days babying it untill i got it tuned. Then, got it tuned at Pure Tuning in Toledo, OH. off the bat it was doing pretty good minus the fact he couldn't get it to idle right. it was very temperamental and would idle good for a couple mins then want to die or randomly want to idle at 2,000 RPM.
after the 19psi successful tune and unsuccessful 24psi tune when the car started missfiring, we trouble shooted for a little bit: replaced coil pack, wires, and plugs.. then gave up with the thought it was miss firing due to either: ignition control module, CAS, or possibly because theres a bad wire to the water temp sensor which supposedly help controls ignition timing.
and even till now in mid April still don't know what is wrong. more trouble shooting and fixing i will do soon. :applause:

 

[TSIMonsteR]

so, the pulley was on backwards? Or the mount just loose?

 

[gyd23]

so, the pulley was on backwards? Or the mount just loose?

no everything was put back together correctly.. its just the the guy that rebuilt it (whom i bought the car from) didn't have the car long enough to catch the fact that the post thats supposed to be pressed into that mount wasn't pressed in right, someone pressed it out (why i don't know) but they did and just put it back in thinking it was ok.. hundreds of miles later that post walked itself right out of the mount. costing me my valves.

 

[cbrack]

That suck big time glad to hear you got it fixed. Its got a crazy DSM demon or something, best of luck with the missfire issue. Maybe try an upgrade ignition or coil on plug setup.

 

[rocket-rod69]

I would double-check valve timing. Sounds like one cam may be off a tooth. They will still run, but not well until up in the RPM range.

 

[95weclipse]

I just got one dumb question. But if you seen that the belt was walking at 250 miles, why would you continue to drive it like that with out taking it apart to check it out? So it kinda sounds like its both of your faults for your valves. I am not trying to be a a$$ or any thing but that's messed up to drive it like that.

 

[Ghost_GSX]

Very interesting. You seem to have the same symptoms mine did. I'm in the same boat as you though. Is this is the Hyundai motor you have swapped in?

 

[gyd23]

Is this is the Hyundai motor you have swapped in?

yes its a G4CS from the '89 to '91 Hyundai's

...yes i definitely agree it was my fault too, but since i haven't been around these kind of cars all that much especially a heavily modified one i honestly didn't know better. i mean it was only about 1/8 to maybe 1/4 to the right and it actually stayed that way for a while. and since the top of the timing cover was cut i could kind of peek down there and see that everything was touching right and looked like it was aligned, but once again not knowing these cars i didn't think about why why it happened. it was a mistake but i learned from it.

Also i did check the physical timing and it all was A ok, minus the fact that my intake cam was (due to adj. gears) advanced approx 5 or 6*... so i will definitely zero that out when i get the car out here to my base, re-time the CAS as well as upgrading the coil pack, possibly replacing the plugs again.

 

[SlowGst88]

i would get rid of those cam gears i cant remember where i read up on it but they were labeled as unreliable due to having on my 3 bolds holding it . and the strip out.

 

[gyd23]

i would get rid of those cam gears i cant remember where i read up on it but they were labeled as unreliable due to having on my 3 bolds holding it . and the strip out.

yea well i wouldn't doubt it... mine are fairly new though and the bolts look to be in good condition and i don't think HKS would make a cam gear to be unreliable. i will look into that though, thanks.

 

[95weclipse]

Those cam gears are like 250 bucks they are not unreliable, I would leave them if you tighten them enough they will be fine

 

[gyd23]

Those cam gears are like 250 bucks they are not unreliable, I would leave them if you tighten them enough they will be fine

..thats what i was thinking, as long as you take care of it and don't strip bolts out it'll be fine, and its HKS.

 

[GST4g63T]

Ive learned with dsms its always better safe than sorry. If your not sure, not 100%, and something isn't quite right, park it post a pic, ask someone. I'm really glad u got it back together. I had a similar random misfire and come to find out I had a bent pin in the cas harness. GL with the GSX I wish you the best.

 

[Lucas71623]

This is so much like what Im going through its crazy! Except Im still 4g63.
Ok I bought a 96 gsx w/ no engine and a 96 talon tsi w body damage and a non-running engine. Then I had an engine built by the dsm graveyard. Had the engine, a new turbo, and new wally fuel pump put in the gsx with all the externals from the Tsi (alternator, intercooler, etc). They had some trouble timing it and asked if i had different cams, i said no, they're oem call dsm graveyard, he did, they seemed to get it worked out. So I get the car and right away its coughing and spuddering when I open her up. AND its idling weird, not missing but the idle would randomly raise to like 2000-2200 rpm. That went away though. As far as it not running right dsm graveyard thought it was boost spike causing fuel cut, so they had me re-route a vacuum hose from my wasegate by-passing my factory bcs (i have an internal wastegate t-28). That wasnt it and I actually posted about this on here and the census came back probably boost leak, but before I could get it in it died, and this is a lot like yours. Im driving(duh) I turn, accelerate and im heading down a long hill so i just put it in neutral and im coasting and the engine dies. Im like wtf? Without thinking I put in 3rd and popped the clutched to fire her up (oops) Im thinking that was bad, cause it started, briefly, then there was a loud bang/clunk kinda sound, followed by some loud knocking/banging, which was my belt slapping around. It turned out my belt did the same thing, I had the cover on so I couldnt see it coming off, but it melted a groove in the inside of the cover where it was rubbing after walking off the cam gears a ways. They havent got to my car yet so i dont know what else if anything got damaged but I'm assuming from the sound and the fact I force started it like that its gonna be bad.
I'm wondering now if I need to inspect those motor mounts, maybe this is my mechanics fault? He cant explain why the belt walked off the way it did. Sorry to thread jack here but this is my 1st dsm, 1st car ive modded more than putting on a cold air intake, i dont know a lot yet, does anyone know another reason that causes timing belts to walk this way?