Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

Engine wont rev - GQ / TB45

Tech Talk for Nissan owners.

Moderators: toaddog, V8Patrol

Forum rules
Post Reply
Posts: 158
Joined: Thu Jul 10, 2008 1:19 pm
Location: Southern Tablelands

Engine wont rev - GQ / TB45

Post by create »

I have a GQ with a TB45 engine fitted. The engine wont rev past 3000rpm on fully throttle. When it hits 3000rpm it stops dead and misfires so it must be electrical. If I drive away slowly with half throttle it will rev to 6000rpm. I have removed the rev limitor from the rotor button and I can find what else it could be. If I use half throttle to get to 5000rpm then floor it the engine makes horrible sucking noises and backfires.

TB45 engine with TB42 distributor
pertronix lobe sensor ignition
NGK BPR6ES plugs 38 thou gap
New bosch plug leads
Bosch GT40 coil
Straight gas no ECU

Anyone got any ideas?????




EDIT:
tittle changed

Kingy
Nissan GQ Patrol '89
TB45 ~ LPG ~ 33' bighorns
Top
Posts: 765
Joined: Fri Mar 12, 2010 7:28 pm
Location: Fixing something else the kids have broken

Post by BadMav »

Check that the intake hoses aren't collapsing. A clogged air filter will make it worse too.
Don't take life too seriously...it isn't permanent.
Top
Posts: 17
Joined: Thu Jan 07, 2010 10:20 am
Location: Sydney

Post by lucifer48 »

I have seen a few crack the dizzy cap where the coil lead goes in.
Top
Posts: 158
Joined: Thu Jul 10, 2008 1:19 pm
Location: Southern Tablelands

Post by create »

Bad Mav - you were right on the money! I ran a coil of fencing wire inside my intake hoes and it fixed it.

Thanks heaps!
Nissan GQ Patrol '89
TB45 ~ LPG ~ 33' bighorns
Top
Posts: 765
Joined: Fri Mar 12, 2010 7:28 pm
Location: Fixing something else the kids have broken

Post by BadMav »

Cool, I had it happen to my 75ser after I turboed the 2H in it. Yeah I did the same coil of wire trick. :idea:

Rowen
Don't take life too seriously...it isn't permanent.
Top
Posts: 317
Joined: Thu Dec 11, 2008 8:22 pm
Location: Oriental 4WD Adelaide

Post by mhgill »

How does it perform? Much better than the TB42??
GQ 5" coils 35" Muds FOR SALE
98 GU 4500 ST Stock.
Top
Posts: 765
Joined: Fri Mar 12, 2010 7:28 pm
Location: Fixing something else the kids have broken

Post by BadMav »

mhgill wrote:How does it perform? Much better than the TB42??
x2
Don't take life too seriously...it isn't permanent.
Top
Posts: 158
Joined: Thu Jul 10, 2008 1:19 pm
Location: Southern Tablelands

Re: Engine wont rev - GQ / TB45

Post by create »

It was well worth the conversion. I also dont have any risk of cracking a head as its rare for TB45 to do it.
I have done a lot of work to the engine also to prepare it for LPG.
I have a build thread on 4WD action forum, have a look there to get the info rather than me post it all here again
http://www.4wdaction.com.au/forum/showt ... hp?t=79902
Nissan GQ Patrol '89
TB45 ~ LPG ~ 33' bighorns
Top
Post Reply

Return to “Nissan”

Who is online

Users browsing this forum: No registered users and 146 guests