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6th May 2023, 07:59 PM
#1
Power loss
Good evening all I have a GQ RB30 carby rig driving it seems to lack power takes a long time to get any speed up and drops back to around 70 going up any hills
Starts and idles great has extractors 2 1/2 inch exhaust plugs seem fine all set to 0.9 mm fuel pumps good sits at 30 psi revs free at stop no missing compression is all around 165psi cold just stumped on what it could be any help would be helpfull
Cheers in advance
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6th May 2023 07:59 PM
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7th May 2023, 12:38 AM
#2
Patrol God
Originally Posted by
Fouldsy67
Good evening all I have a GQ RB30 carby rig driving it seems to lack power takes a long time to get any speed up and drops back to around 70 going up any hills
Starts and idles great has extractors 2 1/2 inch exhaust plugs seem fine all set to 0.9 mm fuel pumps good sits at 30 psi revs free at stop no missing compression is all around 165psi cold just stumped on what it could be any help would be helpfull
Cheers in advance
Have a look at this thread. There is quite a bit of info about the carby in it. I found the second stage butterfly was sticking or not opening properly. http://www.nissanpatrol.com.au/forum...-Helpful-Hints
My advice is: not to follow my advice.
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7th May 2023, 11:18 AM
#3
manual? auto? (clutch slip? TC issue?)
- 1990 LWB Safari flatdeck, TD42 -
- 1988 LWB 7-seat Safari, TD42 -
1989 LWB 5-Seat, TD42
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7th May 2023, 01:30 PM
#4
Manual and just found a box in the back with 3 carbys in it clutch is good no slipping there
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7th May 2023, 09:56 PM
#5
Patrol God
Originally Posted by
Fouldsy67
Manual and just found a box in the back with 3 carbys in it clutch is good no slipping there
The carbies playing up is a common thing for these old buses. I've been on the lookout for a spare carby so I can put a kit in it and keep it for long trips in remote areas.
Last edited by mudnut; 7th May 2023 at 11:25 PM.
My advice is: not to follow my advice.
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8th May 2023, 08:48 AM
#6
Beginner
Same problem, diesel 3L GU 2004. It seems to know when it's close to home and does it on the same hill every time! On the third MAF sensor. New air filter and thorough clean of the intake. She will be coasting along fine then suddenly loses a little power, like she is suddenly driving into the wind. And she does it constantly when towing the caravan! Any ideas welcome. No we haven't done a diagnostic, that's next.
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8th May 2023, 04:48 PM
#7
The master farter
Originally Posted by
Big Girl
Same problem, diesel 3L GU 2004. It seems to know when it's close to home and does it on the same hill every time! On the third MAF sensor. New air filter and thorough clean of the intake. She will be coasting along fine then suddenly loses a little power, like she is suddenly driving into the wind. And she does it constantly when towing the caravan! Any ideas welcome. No we haven't done a diagnostic, that's next.
Possibly a boost leak. Are you running the original intercooler?
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9th May 2023, 08:01 AM
#8
Beginner
Originally Posted by
mudski
Possibly a boost leak. Are you running the original intercooler?
Yes. Had the head replaced last year. Will contact the shop and book her in for diagnostics. What are your thoughts?
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9th May 2023, 08:26 AM
#9
The master farter
Originally Posted by
Big Girl
Yes. Had the head replaced last year. Will contact the shop and book her in for diagnostics. What are your thoughts?
Well if you are running the original intercooler, I would say its leaking. Check the underside of the cooler. Is is clean? Or does it have oil deposits on it.
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9th May 2023, 12:11 PM
#10
Beginner
Originally Posted by
mudski
Well if you are running the original intercooler, I would say its leaking. Check the underside of the cooler. Is is clean? Or does it have oil deposits on it.
Thanks heaps Mudski, much appreciated. I did some research and will get under the bonnet this afternoon. Regards, Louise
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