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91 EFI hesitation help

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Offline ingler99

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91 EFI hesitation help
« on: November 05, 2011, 06:09:35 PM »
I have a 91 samurai that has EFI it has a header and the cat has been removed but it is very sluggish when you first take of or when throttle is barely opened. I replaced plugs wires fuel filter and air filter with no noticeable change it also seems worse when it is cold outside but it won't light check engine light so I am at a loss anyone know where to look? ???
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Offline mrfuelish

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Re: 91 EFI hesitation help
« Reply #1 on: November 05, 2011, 09:22:36 PM »
I would first make sure that it has a 02 sensor and that the connection is good to it and then see if you have a tps and that it is in the right place with a volt-ohm meter.
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1987,1988,1988,1990 samurai's,  1953 m38a1,  1996 x-90,blue.1996 x-90 red.1994 2 door tracker.   only Dead Fish go with the flow.                No Hairy Nosed Wombats were ran over on the trail today.       My ZUK is Xenophobic.
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Offline ingler99

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Re: 91 EFI hesitation help
« Reply #2 on: November 05, 2011, 11:46:10 PM »
it has both so i will check into both for errors thanks
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Offline rbparker

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Re: 91 EFI hesitation help
« Reply #3 on: November 06, 2011, 07:15:58 AM »
Mass air flow sensor may be another suspect.
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Offline mrfuelish

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Re: 91 EFI hesitation help
« Reply #4 on: November 06, 2011, 01:18:05 PM »
I Think he has a MAP sensor.
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1987,1988,1988,1990 samurai's,  1953 m38a1,  1996 x-90,blue.1996 x-90 red.1994 2 door tracker.   only Dead Fish go with the flow.                No Hairy Nosed Wombats were ran over on the trail today.       My ZUK is Xenophobic.
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