When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
It does sound like you have some air in the system. If it's all in the heater core, then that wouldn't cause any engine problems. However, if it eventually "burps", and the air flows elsewhere, then it could cause problems.
If you're running lean, then the spark plug tip will run hotter, so the colder plug will help.
If you have clogged injectors, then you might have large LTFT. Do you have access to an OBDII scan tool to see what your fuel trims look like?
I'd use a large bottle of Techron in a couple full tanks of gas to see if it helps.
i've been reading up on spark plugs.
from what i understand, if the engine is modded, you need to go a step colder. so, with the mods i have, i imagine i would benefit from a colder plug.
i will try to see if the part number you told me is available in malta.
if so, i will replace them and see how that goes.
re airlock in cooling system... how can i get rid of it? when i bled it, i cut up a water-bottle and taped it to the radiator, so i was able to fill it up to about a foot more than the radiator neck. i waited for the fan to switch on and off twice or 3 times. with the heater always on. what more can i do to bleed it correctly?
i was constantly pressing the upper and lower pipes to try and "burp" the system.
I dont have an OBD2 scan tool .... should i try to find someone who does? I dont know what the fuel trims are ... so it wont help much if i had one i guess :s
Re Technron .. i've never seen it locally but i will search for it. up till now i only used one by fuchs in other cars, and i didnt really see a difference.
I've tried several fuel injector cleaners, and Techron is the only one that seemed bto work.
Many auto part stored here in the US will hook up an OBDII scan tool for free to pull diagnostic codes. Maybe you shoudl see if there is a store near you that will hook one up to check LTFT (Long Term Fuel Trim). The LTFT value is what the ECU is adding to the stored fuel map to make the closed loop fuel ratio "right" (14.7:1). If it is very large (5% or more), then I'd say you have a fuel system problem (clogged injectors, fuel pressure regulator, fuel filter, etc.).
There are a few of us in the USA that run the mugen ecu. It works fine with 93 or better octane, which is equal to japan's 98 octane rating(see link below). The OBDII is disabled on the mugen ecu so he would need to swich back to the oem ecu to get a reading with a scan tool.
Hi again everyone.
I've been following this thread from my iphone all day but didnt have time to reply.
I have just bought a set of four BKR8EIX plugs from ebay. They should be on their way from the UK, and should arrive by the weekend hopefully.
I checked up on Toluene. It is illegal in Malta So I have to forget it.
The only suggestion i had from a friend of mine, is to buy racing fuel (available locally) and mix it with regular petrol. I will go to the shop sometime this week to enquire about it.
But maybe I should wait and see how it will work with the new plugs first.
Didnt have time to check up on Techron, but I will check tomorrow if its available locally. If it is, I'll buy a bottle and use it.
[QUOTE=gernby,Feb 8 2011, 06:16 AM]Many auto part stored here in the US will hook up an OBDII scan tool for free to pull diagnostic codes.
I wasn't aware that OBDII was totally disabled on the Mugen ECU. I knew it wasn't OBDII compliant for state inspection purposes, but why would they completely disable it?!? That makes it a total piece of shlt IMHO. Any ECU that has no way to communicate any sort of parameters at all is GARBAGE!
curious ..
i got think from the link Sideways posted ...
2. The shape of the torque curve is different than a stock car's . The power peak moves to 8500 rpm. I haven't really seen any bolt on mods that move the power peak around. Even with a VAFC its hard to do. The Mugen ECU olds power better after the power peak at 8300 rpm (like the VAFC does), but it also moves the power peak up. This is clear evidence to me that the timing is advanced along with a leaner mixture. I also observed more advanced timing on my OBDII scantool at lower rpm. As soon as my computer equipment arrives, we can actually datalog that and show it.
this was by someone who was testing and dynoing the mugen ecu and comparing it to the stock one.
Dressed2Kill, are you SURE that OBD2 is disabled on the mugen?
That is just what I have herd, I have never tried a scan tool with mine but I know that our state inspection computers will not work with it. I run my stock ecu when that time of the year comes around.
Any ECU that has no way to communicate any sort of parameters at all is GARBAGE!
100% agree.
If it never used to do this, then something is messing with timing. How do your plugs look? Sense you didn't bleed your coolant properly, I'd put this at the top of the list.
So I have to forget it.