Outer Limits 4x4 Board

Hi
When taking off in my TB42 i sometimes get a jerking through the engine and when cruising also for eg in 4th gear 2500rpm it will jerk also.

Does this sound like its starving of fuel?

What should I check

Cheers
Eric

I get the same problem but as you i'm not sure what it is, allthough mine is a 90 model auto carby.

check ya filters? air and fuel......or have ya done this already?

Just put a new air filter in, fuel filter was 9000km ago.

Maybe I should change the fuel filter too.

Used to have same problem on my old gas burner GQ. An electrical connection on the coil was loose and now and again it moved causing the engine to loose spark and therefore miss and carry on. go round your engine and anything that looks remotely electrical give it a tighten.

Arrrrh good point, it could be something like that.

Have something similar down around 1600-1800 and chimpboy had much the same issue as well... I suspected mine is carby related but it could be electrical. Might be worth a closer look too.

Update: I have replaced the fuel filter, all the leads and the coil. Next I am thinking Electronic ignition and a carby rebuild. Driving it home tonight it was jerking alot and the tacho was going nuts. Think it could be happening more on a tight corner. If its a fuel issue in the carby, a carby kit would fix it but if it was a fuel pump how would you test that?

Cheers
Eric

PS. if all of these things dont work the Gen III will be going in. Just kidding. I wish!

My brother just fitted new fuel pump to efi 4.2 GQ & has made a dramatic difference to its performance. Starts loads better & pulls much harder up hills etc. Would advise you get the output pressure checked, quick & easy to do won"t cost the earth.

Its not on gas is it. As hottie has his on gas and with there big round filters it used to hit some connecters near the battery. And they where shorting out.
This I think was when the engine was under load ie when the motor flexed over.

hey hows it going all

i had a jerking problem to but ive since got help

all jokes aside
just brought the misses a 90model Y60 GQ RB30s 160.000kms
3 weeks ago
and changed the fuel pump 4days after purchase
the fuel pump couldnt overcome gravity

was running out of fuel when at idle with front end facing uphill (even slight rise)
also starving for fuel on medium/hard acceleration after about 10seconds
also uphills on the move at any speed crawling to 100kms

ripped the pick up assembly out
checked the hoses where not split
prefilter was like new
removed all fuel lines fuel filter etc & blew out lines with commpressed air & blew out carby
clean inside dizzy with electrical cleaner & blew out

was going great guns for 2days after that

then it got worse so i brought a genuine fuel pump $127.40
(repco trade price $430.00)

guess thats why thay sold it
thort thay where up for some bills

anyways id be checking out your fuel pump supply pressure & flow rate

TB42S & rb30s carby fuel pump specs
Pressure 25.5 - 32.4 kpa
Volume 2.6litres per min @ 1000RPM

TB42E efi fuel pump specs
Pressure 299 KPA - 12 volts

cheers

daryl

Thanks guys,
Im getting a pertronix ignitor ignition installed on Sat then I will take it from there. Where is the fuel pump? Do you have to take the tank out to get to it?

Cheers
Eric

PS. its straight petrol no Gas

Keep us posted on the Pertronix setup. I'm keen for one. Is it Igniter II though?

EricB wrote:Thanks guys,
Where is the fuel pump? Do you have to take the tank out to get to it?

Cheers
Eric

PS. its straight petrol no Gas

If its a carby TB42, then its got a mechanical fuel pump located just above the steering box. Or follow the hoses from the fuel filter going towards the front of the car.

Cool, what is a replacement fuel pump worth on a TB42?

Fri night I cleaned out the dizzy and bent the rotor arm a tiny bit and she ran better for about a day then went to poo again. Its getting quite undrivable.

I'll let you know how it runs after the ignitor is installed.

PS. I dont think its the ignitor II

Just had the ignitor put in

Runs like a dream now! The points were stuffed. They were the 2nd set of points in 10,000km.

Now I have a power back that I used to have without the popping and carrying on.

Money well spent for $250 installed. And the Pertronix Ignitor is all inclosed in the dizzy. No boxes in the engine bay.

Cheers
Eric

i bought a fuel pump for my tb42 for $132. i installed it my self. it came with the gaskets and spacers. Make sure u tighten the 2 bolts nice and tight because they tend to leak if u dont. Use permatex or somthing. Its easy and anyone could do it.