1991 Hyundai Excel

ANDYH61

MEMBER
1991 HYUNDAI EXCEL
4 CYL
FWD
MANUAL
120,000 MILES

I have just bought a 1991 excel sprint for my sons first car, it starts first time idles perfectly but under load until it warms up it bunny hops and loses power. You have to put the clutch in and rev the engine to stop it from bunny hopping. After it warms up the engine runs and performs as it should.
Any clues?

Andy Hoffman

5 Replies

RACEFAN966

MECHANIC
5,029 POSTS

OK you will need a digital multi meter and then unplug the coolant temp sensor and do this when it is cold ok. Now measure the resistance across the terms of the sensor (not the wiring harness) and get me the reading and the temp at the time of the test and I will look it up and see if it is in spec. It is on the intake manifold just below the thermostat housing. Here is a pic to help.

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Wednesday, April 1st, 2009 AT 10:25 AM

ANDYH61

MEMBER
3 POSTS

Hi Racefan,
I have just taken a reading and it is 1.46 Ohms,
The engine was cold and the ambient temperature was 28 Degs Celcius.

Also I made a mistake o0n the mileage it is actually 120000 Km Approx 75000 miles.

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Thursday, April 2nd, 2009 AT 3:44 AM

RACEFAN966

MECHANIC
5,029 POSTS

Well this may be 100% fix but the reading is way off. So that sensor is bad and will need to be replaced before we can go anyfurther. Let me know how it goes and if there is a problem.

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Thursday, April 2nd, 2009 AT 9:55 AM

ANDYH61

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3 POSTS

Thanks for the info Racefan,

We live in a remote area so it will tak a few weeks to get the part to me. I will let you know when I replace the sensor.

Thanks

Andy

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Friday, April 3rd, 2009 AT 6:10 AM

RACEFAN966