fueling or spark problem with a rwd 4age

[otazup]

rightyo boys i need your assistance

ive got a rwd 4age starlet, redtop bigport.
ok starts fine, but my prob is it just keeps fowling the plugs (within minutes).
its obvious its running way too rich, its splurts and misses when i drive but at high revs it seems to go hard!!!
It pours fuel smoke out the exhaust when its running , and it also "hunts" for revs at idle.
i removed the cold start because i suspected it was staying constantly on but still running rich.

ok things ive realised could possibly be wrong are..

: the two plugs (green and brown) on the back of the motor arent plugged in (and ive heard the temp sensor (green plug) could be the issue.
: i have an exhaust leak from just after the extractors
: map sensor (doesnt seem to be the issue but im getting another anyway
and..maybe a stupid question, but my alternator is stuffed , that isnt the issue is it?lol

has anyone else came across a problem like this before?? its just weird because when i put brand new plugs in, it goes primo until they fowl up and then it drives like a sack of shit!!!

also, do i have to have an oxygen sensor connected, in the exhaust? ive noticed that mine doesnt have one connected.

the loom wiring does look a bit dodgey, and it could be a bluetop loom/ecu (im not sure if this matters)

i know theres alot more info you may need but i only got this yesterday and ive checked all the obvious problems , but i can go check if you need more info!!

any help very muchly appreciated

cheers
jas

[Lloyd]

Temp sensor plugs will be the place to start. If there is no reading or the ECU is seeing that there is high resistance then it will go rich. I'd imagine the lack of an oxy sensor would just make it stay open loop.

This wouldn't have anything to do with the MAP sensor you're looking for either would it?

[otazup]

thanks for the reply,

ive have alot of differing views about this, but a few have said map sensor so yes im looking for one ,so i can eliminate that theory....

but yea i thought it would be that temp sensor too, so im prob going to look into this first.

has anyone ever had there temp sensor(green plug at the back of the motor) disconnected, if so how did it run?.

thanks again

[Lloyd]

Find a 300ish ohm resistor and put it over the pins in the green plug and see if it makes any difference. Pretty sure green is the ECT plug for the ECU

[l1ttle_d3vil]

yeah get both the green and brown plugs connected, and make sure the sensors are workin fine.

they are for the water temperature (which basically tells the computer how much fuel to put in), and the other one is for the cold start injector. also not running an O2 sensor can cause it to run rich sometimes.

i had the exact same problem with my bluetop ke35, went through about 8 sets of spark plugs. those water sensors were the problem, and also possibly some wiring on my dizzy which was faulty (cant remember if this was part of the problem or not though).

[repowered]

its obvious its running way too rich, its splurts and misses when i drive but at high revs it seems to go hard!!!
It pours fuel smoke out the exhaust when its running , and it also "hunts" for revs at idle.
i removed the cold start because i suspected it was staying constantly on but still running rich.

just got mine started again yesterday and its doing exact same thing!

it was hunting real bad but then i found the dizzy was fully advanced so i put it back to where i had marked it and it just runs rough now, when you try drive it its like it has no power when u give it some gas. it doesnt hunt as bad but the revs slowly climb, then drop down again suddenly. ill check what you guys suggested. - pulled vacum line off map sensor and it thing almost stalled, dunno if thats atest or not lol

will also plug o2 sensor in and see what happens. (need to extend wire as it's way down the back of the extractors)

[crnkin]

do a compression test jase, number one cause of 4ages fouling real bad

[jondee86]

Torque (Nm) = (kW x 9550)/rpm



Cheers... jondee86

[crnkin]

Torque (Nm) = (kW x 9550)/rpm



Cheers... jondee86

Thats nice, seeing its the same thing. Yes, i passed school C.

[l1ttle_d3vil]

it was hunting real bad but then i found the dizzy was fully advanced so i put it back to where i had marked it and it just runs rough now, when you try drive it its like it has no power when u give it some gas. it doesnt hunt as bad but the revs slowly climb, then drop down again suddenly. ill check what you guys suggested. - pulled vacum line off map sensor and it thing almost stalled, dunno if thats atest or not lol

i ddint say that stuff in your quote!
how do you mean its "hunting" for revs? as in revs are lifting and dropping again and again when its idling? this can be caused by vacuum leaks too, or if the idle screw is wound too far back so check that aswell, may be something completely unrelated to the fouling.

[repowered]

i ddint say that stuff in your quote!
how do you mean its "hunting" for revs? as in revs are lifting and dropping again and again when its idling? this can be caused by vacuum leaks too, or if the idle screw is wound too far back so check that aswell, may be something completely unrelated to the fouling.

WTF lol! sorry man not sure how that happened. - yea it was rising and dropping revs. not doing that as bad now - idle screw isnt all the way down. just idles rough and is slow to pick up revs - lots of fuel smoke (steamy) out exhaust.

got spare water temp sensor from a spare motor, not sure if a FWD bluetop one is diffrent to a RWD one.

ill check vacum leaks cheers

[$CENSLS1$]

Have you check the timing etc?Is there any kind of oxy sensor in the exhust that you know of?If so it maybe getting a false reading becuase of the split in the exhust below the headers that you told us of and hence feeding the engine more fuel than it should be?Just a thought...?

[repowered]

Have you check the timing etc?Is there any kind of oxy sensor in the exhust that you know of?If so it maybe getting a false reading becuase of the split in the exhust below the headers that you told us of and hence feeding the engine more fuel than it should be?Just a thought...?

yea i put the o2 sensor in and ran a wire to it. a flange has been put in the extractors just after the collector where it joins to 1 pipe.

didnt make much difference.

going for tune up today

[l1ttle_d3vil]

got spare water temp sensor from a spare motor, not sure if a FWD bluetop one is diffrent to a RWD one.

just, fwd and rwd should be the same. if they look the same and bolt up then it'll be sweet.

[repowered]

got spare water temp sensor from a spare motor, not sure if a FWD bluetop one is diffrent to a RWD one.

just, fwd and rwd should be the same. if they look the same and bolt up then it'll be sweet.

oh yep though so aye. - just checking 1st

probably a vacum leak somewhere.

a while back i changed the gasket on the Inlet manifold but i missed doing the one on the other side of the TVIS plate! DAMIT! at the time i didnt have a tourqe wrench so couldnt tourqe up the bolts , just did them up from the inside out, and got them all tourqed up rought the same.

how critical is getting this tourqed right? i hope its not warped and sucking air in. ill ahve to have a spray around with the CRC see if the engine picks up.

[repowered]

lastest update on this is

hunting has stopped - i dont think the brake boost line was on very well and have pluged in o2 sensor.

idle it steady but rough and when you try rev it up its quite slow to pickup and then when you let the throttle go it pauses for a tad before revs come back down.

lots of 'steamy' stuff out the back and some water. will check water level tonight and check if it circulating when hot.

[l1ttle_d3vil]

yeah, i had that problem too haha. only thing is i cant remember what was causing it. it was either the timing/distributor wiring, or a vacuum leak. check your map sensor vacuum lines too, and make sure you've got the 3rd adaptor thing on the vacuum port blocked off if you're only using too (the black thing that the vacuum lines from the map sensor and fuel reg go to on the manifold)

[repowered]

yeah, i had that problem too haha. only thing is i cant remember what was causing it. it was either the timing/distributor wiring, or a vacuum leak. check your map sensor vacuum lines too, and make sure you've got the 3rd adaptor thing on the vacuum port blocked off if you're only using too (the black thing that the vacuum lines from the map sensor and fuel reg go to on the manifold)

yea we put it on the tune scope and it was just the timing really set it to 10Deg. runs heaps minter!!!

also you running 91 or 96 gas?

[l1ttle_d3vil]

wicked, you'll be stoked once you finally get it going mint and all legal aye!! we only got 98 up here so thats all I run, unless you go to shell which still has 95.

[repowered]

wicked, you'll be stoked once you finally get it going mint and all legal aye!! we only got 98 up here so thats all I run, unless you go to shell which still has 95.

that random how you only got 98! only some BP's here have 91 ,96 and 98.