Help greatly appreciated
Discussion
Hello, im hoping someone could point me the right direction. My newly rebuilt 4.3 runs really great.....with the Airflow meter and Stepper disconnected, if a little rich, connect them up and it seems to run on just a few cylinders on one bank. The manifold fron 2,4,6,8 goes cool, 1,3,5,7 is as normal, the oil is full of fuel (changed quickly), plugs mostly wet with fuel a few sooted up. Ive changed the stepper and meter but its still the same, Rover guage indicates all is well, ive checked for air leaks but have found none......my added problem is my abilities with a Multimeter are no match for the Spanners and Calipers, im seriously thinking of installing some Downdraft Webers lol. KInd regards, Neil
Thanks, yes ive tried another meter...no change. Im thinking along the line that ive nipped a wire or connected somthing incorrectly. Every so often with the Stepper and Maf connected i seem to catch the sweet spot while coaxing some gentle revs on the throttle, just for a second or so, mostly when the revs are comming down. Great compression, Oil pressure and Spark.
Update...ive put a Noid light on injectors and am getting a really fast dull flash on all, id say it was almost constant. Looking at Noid lamp tests on you tube they seem to show a really bright slow pulse at idle...so i think im on the right track? Putting my meter across ecu pins 2&13, 2&11 (Both Inj banks) and 7&25, 32&25 (Fuel&Coolant sensors) i get nothing so i will now start hunting for the short to ground. Before i do does anyone know which one of the earthing points these use? Worth a check.
Thanks for that. Ive spent a bit of time on it this evening.....running the meter across the inj connector with ignition off i get 0.00...turn key to ignnition on and i get between 0.010 - 0.012 across the full 8. Tried Noid light again..ignition off = no light, ignition on = no light, cranking = no light, as soon as she catches very dim, ALMOST constant light...as the engine revs drop off to stall the light fades.
Rover gauge again shows no fault codes all seems well, Map 2 displayed (but this section did take a min or so to populate, can't remember it doing that before...fuel and coolant temp all ok, pump ok.
I pulled the ECU plug and again checked pins 7 & 25 (Coolant) with ign on...this time i got a reading, along with pins 32 & 25 (Fuel) I think i probed them the wrong way around last time (i said electrics weren't my strong point), but no matter which way around i tried i still got nothing from 2 & 13 and 2 & 11 (both banks).
Last night i dissconnected the pos lead from the battery and ran a bulb tester from it to the terminal....i had light...as i was leaning in through the open n/s door i pushed the interior light door switch as that was the only thing still working, when i did the light dimmed then started pulsing accompanied by a clicking noise which seemed to come from under the center console, then the alarm went off.
I checked the earth to the N/S head..all seemed ok here, i have done a full body lift chassis refurb and have tried to be very careful with the earthing points....every thing else works.
My plan tomorrow is to remove the Plenum and Trumpet base so i can get a good look at the wiring you mentioned...joy!
Rover gauge again shows no fault codes all seems well, Map 2 displayed (but this section did take a min or so to populate, can't remember it doing that before...fuel and coolant temp all ok, pump ok.
I pulled the ECU plug and again checked pins 7 & 25 (Coolant) with ign on...this time i got a reading, along with pins 32 & 25 (Fuel) I think i probed them the wrong way around last time (i said electrics weren't my strong point), but no matter which way around i tried i still got nothing from 2 & 13 and 2 & 11 (both banks).
Last night i dissconnected the pos lead from the battery and ran a bulb tester from it to the terminal....i had light...as i was leaning in through the open n/s door i pushed the interior light door switch as that was the only thing still working, when i did the light dimmed then started pulsing accompanied by a clicking noise which seemed to come from under the center console, then the alarm went off.
I checked the earth to the N/S head..all seemed ok here, i have done a full body lift chassis refurb and have tried to be very careful with the earthing points....every thing else works.
My plan tomorrow is to remove the Plenum and Trumpet base so i can get a good look at the wiring you mentioned...joy!
Great, i disconnected all the injectors but left the noid light in number 6...turned it on the starter, no light, but as it spluttered the noid lit up dimly as before. Running the meter as you said again gives me the same result as when i ran it between the inj plug terminals 0.010. As soon as the weather breaks i will start checking the earths and wiring.
This evening i removed the Plenum and trumpet base to give myself some room. As i still had all the inj plugs disconnected i thought id try the meter to ground again...still .0010 on the left side but i found that i had the full 12v on the right, wire clip towards me pointing down (Brown Orange). As soon as i plug in just one i get 12v to ground on both sides of the other 7 plugs, Still nothing at ECU.
Yes id checked those before....strobe on all showed good pulse, plugs wet and as i mentioned disconnet the maf and stepper, blip the throttle she runs great ??? Stepping back a bit and giving it some thought last night i remember the only wire i was a little unsure of when i connected things back up was the white wire which comes out of the ign amp (runs from the neg of the coil into the amp,and back out). It has a female connector on it.... ive run it to a male which comes out of the loom part way up the branch which runs to the Maf...is this correct? When its connected and i turn the dizzy the fuel pump pulses....disconnected it it doesn't.
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