Starts rough, shakes alot and wont go hire then 3 RPM - MR2 Owners Club Message Board
 
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post #1 of 10 (permalink) Old April 8th, 2019, 11:38 Thread Starter
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Timing is correct. Spark is good, compression is on specs. Has new 02 sensor, new tps sensor. New gas pump and gas filter. Change all the fuel injectors rings and gas filter. New distributor cap as well. What can it be?

https://www.dropbox.com/s/vviy9d4jq9...55342.mp4?dl=0

Last edited by Antoniomk1; April 8th, 2019 at 12:04. Reason: Adding info
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post #2 of 10 (permalink) Old April 9th, 2019, 08:11
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Have you checked the water temperature sensor? My when bad and the car ran like crap..
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post #3 of 10 (permalink) Old April 11th, 2019, 19:42 Thread Starter
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No didnt think of it. How would the temp sensor have this affect on it though?
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post #4 of 10 (permalink) Old April 12th, 2019, 07:33
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I would also suggest testing the throttle position sensor. Test it back at the ECU to include all the cables and connectors. A disconnected TPS can cause a similar problem.
Good luck
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post #5 of 10 (permalink) Old April 12th, 2019, 13:06
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My suggestion is to make sure it's running on all 4 cylinders too. Pull each plug wire from the spark plug one by one. If you pull a wire and it doesn't run rougher then you have a cylinder that's not firing.
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post #6 of 10 (permalink) Old April 12th, 2019, 18:57
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Hi Antonio,
Just watched the video.
My guess is that it could be any of: bad gas, fouled plug/s, not running on all four cylinders, or vacuum leak.
I think that any of the above can make it run rough like that.
What does the exhaust smell like? any raw/unburnt fuel smell to it?
I once had spark plugs that looked great by visual inspection but my mr2 would miss and stumble above 4000 rpm. Replacing the plugs fixed the problem (after replacing the fuel filter didn't help).
That it doesn't go past 3000 rpm makes me wonder if there is a cylinder not firing.
Come to think of it, a couple more things come to mind: a bad ecu, and timing belt jumping a tooth... hopefully neither of these.
Luckily, testing some of these is relatively easy (filling new fuel, pulling plug wires while running, replacing with new spark plugs). Hopefully, it's nothing more serious than these.
Good luck.
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post #7 of 10 (permalink) Old April 15th, 2019, 15:53 Thread Starter
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First of thank you all so much for your response they have been super helpful I was so frustrating and thankfully with all your help and suggestions the problem is solve., this was do to out of order spark plug connection. Now the only thing left to correct is: the fume gas smell that comes from the exhaust manifold. I want to replace it new. You guys have any suggestions yo find one?
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post #8 of 10 (permalink) Old April 17th, 2019, 17:47
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Have you checked the firing order?
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post #9 of 10 (permalink) Old April 18th, 2019, 06:18
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Sometimes the adjustment on the fuel pressure regulator can back out.
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post #10 of 10 (permalink) Old April 18th, 2019, 12:13
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I was window shopping on Ebay last week and found some manifolds for mk1 MR2 for sale. There were some new ones (aftermarket headers) and some old ones (used non-sc manifolds). I don't know if Toyota still sells these.. maybe they do, but likely $$ expensive.
But I doubt that the gas fume smell is from the exhaust manifold itself. Perhaps some of the unburnt fuel is still lingering from when the firing order was wrong. But that will correct itself as you run the car over time. I'm guessing it's still running rich for some reason which is why you're smelling fuel in the exhaust.

Side thought -- Maybe it's your vapor canister that's old/saturated and needs replacement. I've read that others with this issue generally smell the raw fuel smell around their car besides in the cabin.

Edit (sorry - meant for OP)

Last edited by kootch27; April 18th, 2019 at 12:14. Reason: reply was for OP, my bad.
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