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The mkiv Supra Owners Club

Engine problems (2jz-ge)


Guest Stef

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Today , I washed my car. I washed it underneath the bonnet (the engine bay) as well, but not on high pressure. Took it out for a spin then, and nothing funny occured. Did a small burnout, but nothing spectacular (all on a warm engine). The car drove like a dream as always. I parked it in front of my door, and that was it.

 

I just started the car again, as I needed to go to a party, and all of the suddent the car is shaking, the exhaust is making puffs non-stop, and when I floor the gas the car is shaking a lot, and it gives you the feeling it doesn't want to drive anymore. No engine management control lights went on, but the exhaust doesn't sound right, and it seems there is a bit of a smell (can't place it, could be the normal gas-burning exhaust fume).

 

Could this be the spark plugs, or something else?

If wanted, I could upload a small movie so it's possible to see :)

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Did you use a hose pipe or the pressure washer on low power under the bonnet, if so you may have an issue as it is a big no no, you may have water sitting in the spark plug area, if you know what you are doing take it apart and dry everything off, if you dont take it to a garage and get them to sort it

 

Someone may respond with exactly what else to check, coil pack etc

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Okay, with this information I have contacted a friend, he is coming over right now, so he is going to look for that at first (he is a lot more technical than i'll ever be ;) ). Is is possible to have an hair dryer get all the water out? With warm or cold air? (he'll probably know, but then again :))

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I dont run turbo's, so I guess I don't have a downpipe ;)

My friend took off the entire intake manifold, and we learned 3 things:

 

2jz-ge sucks for sparkplug checking

the 6th spark plug was wet

all 6 plugs need replacement

 

All had gaps of approx 2mm, so I'm gonna get 6 new Denso Iridiums. In the meanwhile we kept everything off, I won't be running the car anymore until the new spark plugs are fitted. Thanks for the help! :)

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Ok, we have changed the plugs (correction, my friend changed the plugs) but it still seems to be misfiring, as you can see in the video:

image

 

Any idea's on what this can be? It revs normal, but it sounds like it is misfiring a lot of the time, but not quite yet always...

 

Thanks!

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Hmm, we decided to drive it to my friends garage (heated, oh my!), so I drove pretty carefully. Never above 3000 rpm's, until I hit an 50mph road, here the car was feeling a lot better, and wasn't misfiring anymore. So I decided to test it, and it seems to work quite nice again, response is even better than before!

 

Thanks for the help, it has been very usefull :)

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