Author Topic: Hey All - Himalayan is running rich after new throttle body.  (Read 300 times)

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johnyelland1234

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Reply #15 on: January 10, 2022, 11:44:17 am
Have you checked the air filter ?

Checked that. Looks brand new and is clean inside. These bikes are serviced every 3000mls though.


robinb

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Reply #16 on: January 10, 2022, 11:51:38 am
thats good.

did you figure out what the 60v setting was on the article i linked ?

if the have checked the 0.56v, the pump etc.

The only other thing is the MAF sensor
.
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johnyelland1234

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Reply #17 on: January 10, 2022, 12:36:15 pm
thats good.

did you figure out what the 60v setting was on the article i linked ?

if the have checked the 0.56v, the pump etc.

The only other thing is the MAF sensor
.

I did have a search around and checked the workshop manual, but couldn't see anything about the voltage.

Good point about the MAF (called O2 Sensor) on the Himmy. It's very easy to remove, so I might do that and see if it needs a clean.

Haven't done the TPS yet, waiting for a new Iridium spark plug first.


zimmemr

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Reply #18 on: January 10, 2022, 04:23:48 pm
I did have a search around and checked the workshop manual, but couldn't see anything about the voltage.

Good point about the MAF (called O2 Sensor) on the Himmy. It's very easy to remove, so I might do that and see if it needs a clean.

Haven't done the TPS yet, waiting for a new Iridium spark plug first.

I've never heard of an 02 sensor being referred to as Mass Air Flow Sensor. MAF's measure the amount of air flowing into an engine, while 02 sensors measure the amount of oxygen in the exhaust gases.  https://www.samarins.com/glossary/airflow_sensor.html

But that aside I've seen plenty of 02 sensors fail, they're generally considerd an expendable part like a sprk plug or air filter, and in fact I suspect the one in my own Himalayan was acting up, but in my case I think it was causing the bike to run lean. I bypassed mine, when I removed the CAT, and the bike has run perfectly ever since. My local dealer, who I trust, has told me he's had one instance of a Himalayan running overly rich that was traced to a bad 02 sensor as well. Generally a failed 02 sensor will set the CEL, but not always so it's certainly something you want to check.


robinb

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Reply #19 on: January 10, 2022, 04:35:24 pm
an O2 sensor is in the exhaust side. (also known as Lambda)

MAF is on the inlet side.

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johnyelland1234

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Reply #20 on: January 10, 2022, 07:28:23 pm
Oh yes you're right.

I'm taking the fuel tank off tomorrow to finish wiring in my new spots. I'll try to remove the O2 sensor and see if it's coked up and give it a soak in petrol if needs be.


johnyelland1234

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Reply #21 on: January 14, 2022, 06:19:42 pm
New Spots. Had to design and 3D print some carbon fibre Nylon brackets that do the same as the Mad Dog ones. Couldn't find them for sale in the UK.



Also removed the spark plug and fitted a new standard one so I don't foul up the Iridium one that'll eventually go in once the issues are sorted.



Looks fine to me, and according to the comparison chart. Going to be removing the oxygen sensor and cleaning it with throttle body cleaner tomorrow.

I think the issue is the surging/misfiring. When idling cold, it idles at around 800-900rpm. It surges but misses the odd ignition cycle, as the idle is so low, I think it's cutting out before it picks back up. Thinking faulty ignition coil. But I'll try the oxygen sensor first and see what happens.


robinb

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Reply #22 on: January 14, 2022, 06:33:50 pm
keep us posted.
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Carl Fenn

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Reply #23 on: January 16, 2022, 10:19:32 pm
Just as a matter of interest have you been riding off road and riding in water they can take in water from the rear wheel into air box which can effect running, did they fit the right body at the dealer 4 or 5 for instances l think there would be some difference.