you can use brake cleaner on the afm, just let it dry/evaporate before reinstalling.
any engine will scream at WOT. try not to do it.
spark plugs will not cause this much fuel consumption, had a 3.0 skyline with two burnt off electrodes and still didn't use that much fuel.
change the ecus temperature sender unit on the water jacket. $5 dollar part. plenty of them around.
IF the cat was blocked you would have an ecu fault within 5 minutes of driving
let the engine idle and spray CRC around it while running, if there is a gasket leak it will suck the crc compressant into the intake and you will hear the engine idle pick up.
40wav,
May 19, 7:04pm
I dont think the plugs have 'opened up'. I think they were installed with that gap as they looked pretty good. As they have been running at a 2mm gap for 10k would this shorten the life of them! They looked OK. I do know what old shite looks like as I have nursed old Falcons and Holdens along in the past on no budget, even back when we had leaded fuel!
snoopy221,
May 19, 7:05pm
I could well acceptably stand correctedhere. Acceptably a -15 would be a 1.5 millimetre gap. (Earlier used to be -11)
40wav,
May 19, 7:05pm
This is the Ecotec
40wav,
May 19, 7:09pm
No problem mate, Thanks for your comments. It's all good. This is a 1995 so the first of the Ecotec engines. There seems to be some odd thing with heat shields on the plug leads from 02/95 to 05/95 or somewhere there. Mine's an 11/95 so after that. Most say they ditched the heat sheilds anyway as they caused arcing to the manifolds.
hrt,
May 19, 7:09pm
Plenty of the later Falcons and Commodores are running 1.3 and 1.5mm gaps, yours should be the plugs I stated. I'd assume your manual says that too. If you had 2mm gaps before then someone has either put plugs in with the wrong gap or they have decided to gap the plugs incorrectly. A bigger gap will essentially be making the spark weaker and more prone to breaking down under load. Try the correct plug, new (which should be pregapped if they have the 15 in the part number) and see how you go.
snoopy221,
May 19, 7:11pm
End of the day a BPR6EFS-15is a standard copper electroded spark plug-and Reality is 8000 kilometres is the fuel effective life of a standard plug. That is the point where electrode erosion wear and edge rounding causes fuel economy to suffer-and observation on a tunsecope shows excessive firing voltage requirement
And if you ever saw spark plug firing voltages on a tunescope- you would understand the effects of spark erosion from igniting a fuel air mixture under combustion pressure and temperature.
usdefault,
May 19, 7:11pm
If you can here it sucking air then you either have a throttle body gasket leak or a perished/cracked or lose hose somewhere.
Might need to do a smoke test to look for vacuum leaks.
40wav,
May 19, 7:12pm
Thanks for the info on the AFM. What is WOT! Cheers.
40wav,
May 19, 7:19pm
It's not that it's 'sucking air', it just takes a big gulp of air before revving. Can hear it throught the air filter. I'll check for leaks though anyway to eliminate that. Cheers.
usdefault,
May 19, 7:26pm
WOT= wide open throttle
You can get special MAF cleaner, if I were you I'd use that rather than CRC or brake cleaner as the latter 2 are not designed to clean Mass Air Flow sensors.
40wav,
May 19, 7:29pm
Thankyou.
40wav,
May 19, 8:51pm
Thanks all, really good advice here. Only question I still have is - can I remove the CAT without detriment, and will this improve things! Cheers all.
hrt,
May 19, 8:54pm
Catalytic converter is there for emissions, nothing more. You'll kill some cute and cuddly bunnies somewhere by taking them out, but it wont cause any issues with how the car runs by removing it.
morrisman1,
May 19, 9:02pm
Is the TPS working! Without that then the computer won't do the 'accelerator pump' and it will stutter when you poke the noisy pedal then roar into life
40wav,
May 19, 9:05pm
Is that 'throttle position sensor'! How will I tell if this is not working! It just has a lag when I rev it in neutral, like it needs to gulp some air then it revs out. Cheers
40wav,
May 19, 9:06pm
So are they not a restriction in the exhaust in any way!
morrisman1,
May 19, 9:09pm
It should have resistance across two of the (normally) three terminals. That will change depending on the position of the throttle and the computer reads the voltage between 1 and 5 volts. I don't have information specific to that engine sorry so that's about as much help as I can be
40wav,
May 19, 9:13pm
Cheers for your help.
usdefault,
May 20, 9:33am
Yes the cat is restrictive to backflow.
Remove it and release some ponies.
timmo1,
May 20, 9:56am
Not really consistent with the poster problem though- A blockage in flow caused by a blocked/stuffed cat would be felt as power loss, especially up in the revs whereas this problem is a hesitation at low revs.
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