excelerating=good decelerating=bad

[eastcoastchaos]

i've finally got it running again. rebuilt head, tubed the crap out of it and it runs pretty strong, and with the 300 or so pounds of stuff i took out of it, it seems fast i rocked like a 50 yard rolling burnout in 2nd gear, so it's making good power on the throttle, but as soon as i let off it's violantly shaking and every now in the it will just stall out. i think the timing is a little off but when i set it to 15-20 btdc it won't run at all. according to the light it runs best aroun 40-50btdc, idk i don't think the timing light is accurate, but i also don't think thats the only problem. anyone have any idea? i'm pretty lost and i'd really like to start driving her instead of my bike during rainy season. please please help. ~ben

[eastcoastchaos]

god damnit it's backfireing like crazy and not starting again. the fsm says the coolant temp sensor is the only thing to check when backfire occurs, could this really be the whole problem?

[steve s14]

sound like it would be a good place to start.i would also double check the timing chain timing.

[benemorius]

Unless your timing light is of the adjustable type, it's pretty hard for it to lie. I agree - something is up with the timing.

[eastcoastchaos]

would the car excelerate so strong if the cam timing were off though. it seemed to me like there was really only one way to put it all back togeather.

[benemorius]

I can't really say for sure about the acceleration. I just can't get past the timing light showing way off. Was the idle at a normal speed when you checked it?

It does only go together one way to a certain extent, but there are many different positions that the chain can go on the cam gear and only one of them is right.

[eastcoastchaos]

it was idleing around 1000. compression would be ****ty too though if the cam timing were wrong? i think? anyhow how badly can the coolant temp sensor effect this. it looks a little green/rusted on the terminals

[benemorius]

Yeah compression would be less than ideal if the cam timing were off. Is the compression looking good? I have yet to actually see a bad coolant temp sensor, so I don't have any first-hand experience with it's effects. You can test it with a multimeter. While you're at it, test the MAF and TPS as well. If you don't know how or don't have a multimeter, search the forums for the info and go buy one; don't just blow it off.

Oh and when setting the timing, make sure you use the correct procedure. Engine rpm has an effect on it, too. If you're idle is too high while you're using the light, it will be off. I'm not sure how great the effect would be of an idle speed like yours. You might try to get the idle speed down to normal and recheck.

[eastcoastchaos]

wont even start now so the timing will be a little while, compression was 180-182 on all 4 cylenders, which is perfect as far as i know. i got a new sensor but i still have the stock plug part of it and i just noticed that the 2 wires going into it are exposed and green looking. one of them looks like it is even cut a little bit. i'm gunna try to get a new plug for it. thaks for all your help and sticking with me.

[steve s14]

the coolant temp sensor can actually affect an engine a lot. it can cause the engine to run excessively rich or in rare cases lean. if you have a lot of corrosion on the terminals on the coolant temp sensor, don't take any chances, replace the sensor and the plug so that you have an accurate signal to the ecu. otherwise it can foul out the plugs and cause a no start condition on warmer days. that and a combination of another problem such as ignition timing can really reak havoc on your engine performance.

[crunchy peanutbutter]

about your question on power and timing. i rebuilt my ka24de.when i put it back together.I didint set the timing with a light. I did it by ear(i didnt have timing light at the time).but the timing was at 35 and it had alot of power.but it was hard to crank,it ran rich,the idle was funky,it backfired and the motor shaked. when i finally bought a timing light I set the timing right . the power was not that great but the problems were gone.