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Check Engine Light & Rev Counter drops out

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Check Engine Light & Rev Counter drops out

Postby BigHorney » Sat Sep 22, 2018 6:29 am

Hi All,

I have a 1995 Isuzu Bighorn 3.1TD, Engine No. 4JG2

Check Engine light comes on intermittently when driving, even @ 100kmh.

With the Check Engine light the Rev Counter drops out altogether and the engine starts pulsing quite a lot - so isn't happy about something, if I come to a stop it can stall due to the pulsing revs

If I turn off the car and start it up again the Rev counter comes back and the Check Engine light dissappears - albiet only for a short time until it happens again.

Issue seems to have crept in since I had a slipping Alternator belt due to a broken Belt tensioner - I feel this could still be related to my issue and maybe needs even more tightening but maybe I'm wrong

Has had me baffled for some time.
BigHorney
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Vehicle: Isuzu Bighorn 1995 3.1TD - Engine No. 4JG2-204149

Re: Check Engine Light & Rev Counter drops out

Postby geeves » Sat Sep 22, 2018 3:19 pm

is this the electronic or mechanical pump?
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Check Engine Light & Rev Counter drops out

Postby BigHorney » Sat Sep 22, 2018 4:29 pm

Not too sure on that one Jeeves, it's has a manual diesel pump located in the engine compartment if that's what you're referring too.

Or maybe you're referring to the cabling from Gearbox to Dashboard for speed/rev regulating.

This model is a 1995 3.1TD

I was trying to replicate the problem and was switching from 2WD to 4WD and then it happened whilst idling and rev counter drops out and the engine starts pulsing up & down by itself.

not sure if I have narrowed it down, I can only see a VSS Vehicle speed sensor underneath connected into the Gearbox, not sure what other gadgets are under there to check
BigHorney
Isuzu Baby
 
Posts: 3
Joined: Sat Sep 22, 2018 6:03 am
Age: 46
Country: NZ
City: AKL
Vehicle: Isuzu Bighorn 1995 3.1TD - Engine No. 4JG2-204149

Re: Check Engine Light & Rev Counter drops out

Postby BigHorney » Wed Oct 10, 2018 10:27 pm

Pretty much believe this is due to the slipping belts
BigHorney
Isuzu Baby
 
Posts: 3
Joined: Sat Sep 22, 2018 6:03 am
Age: 46
Country: NZ
City: AKL
Vehicle: Isuzu Bighorn 1995 3.1TD - Engine No. 4JG2-204149

Re: Check Engine Light & Rev Counter drops out

Postby geeves » Thu Oct 11, 2018 2:02 pm

My money is on the governor in the diesel pump. 95 could be manual or electronic. Have a look The manual has a cable on the front the electronic a box on the back and no throttle cable. Electronic pumps are known foe governor faults and this is the symptom
Sanding your knuckles before starting work can help. That way you cant skin them
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geeves
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Joined: Sun May 10, 2009 1:36 pm
Location: wellington
Age: 55
Country: NZ
City: Wellington
Vehicle: 94 bighorn
96 wizard


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