Godfullsam: And what makes u think fuel is d reason for d problem in ur car? I thought Nigeria is one of d producer of best unleaded fuel in d world..

sleekman: Anything that isn't wanted in a mixture/compond is an impurity. Leaving lead in fuel decreases d octane content and makes d fuel burn faster than unleaded fuel. Unleaded fuel is a high octane fuel which burns slower and is used primarily in high capacity petrol engines eg Aluminium block engines found in benz S-series or AMGs. The higher octane fuels sometimes don't work on some engines cos they supply 2 much oxygen 4 it 2 operate optimally. Perhaps this is why honda has these issues. I don't think though that Acura will have have this problem cos they have high performance engines.

clemz85:

pls can you help me provide this information? I want to know how many thousand is my RPM here, am sorry the pic isn't clear, it number 0 - 70 by ten ten jump

NumberOne2:

So only a link could solve the issue of Honda starting at 1,500rpm?
Mine idles at 1,500 and takes less than 4 minutes to warm up so I guess those that do less than 1,500 on cold start should take longer time to warm up. They both probably end up consuming the same amount of petrol to warm just that one takes LESS TIME.

I have seen cars that idle for up to 10 mins before warming which is just crap. This especially occurs if the THERMOSTAT has been bypassed by connecting the fans directly to the battery.

9icetoo:
I agree that anything that isnt desired in a mixture is an impurity. However, lead does not decrease the octane rating of petrol. Before the eighties, petrol was sold with lead in it to prevent detonation> The lead content actually acted as an octane booster. The advent of catalytic converters made lead in petrol undesirable cos of the negative effect it had on the expensive catalytic converters. Other chemical compounds were formulated to boost the octane rating of petrol. Unleaded fuel is not high octane fuel as you believe. Almost all the petrol sold today the world over is unleaded except for very few petrol stations around the world (i don't think nigeria is included) who sell leaded petrol and they clearly mark it out as leaded so you don't mistakenly put the leaded petrol into your modern car. In fact, the dispensing nozzle on a leaded fuel pump will not fit into the petrol receptacle of your modern vehicle. Unleaded fuel is not for high performance cars alone let alone being only for S series or AM whatever. Higher octane petrol are needed in engines with high compression ratios. The higher the compression ratio, the higher the chance of pre-ignition and detonation which could be catastrophic for the engine. Lastly, the higher octane petrol does not supply the oxygen for combustion; atmospheric air drawn into the combustion chamber through your air intake manifold does.
Honda and Acura cars often have engines with high compression ratios sometimes greater than 10:1. With compression ratios this high, low octane petrol will pre-ignite from the immense pressure in the cylinders. The engine management system detects this as knocks and retards the ignition timing which leads to a loss in power. This effect is what the OP noticed. It goes away once you fill up again with a higher octane petrol. Toyotas seem to be immune from this effect because most toyota engines run with moderate compression ratios. My 1.6 litre honda has a higher compression ration ratio than my toyta camry so i am particularly careful about where i buy my fuels for the honda. I refuel the honda at only Total filling stations.

Witty07:

This isn't your rpm guage. It should be like

clemz85:

have you ever rev your engine to 5k before? or what does your engine rev @ 140speed? mine revs to 4k @ 140+ and that's the highest I have done due to unstable road condition to avoid touching stories.

9icetoo:
I agree that anything that isnt desired in a mixture is an impurity. However, lead does not decrease the octane rating of petrol. Before the eighties, petrol was sold with lead in it to prevent detonation> The lead content actually acted as an octane booster. The advent of catalytic converters made lead in petrol undesirable cos of the negative effect it had on the expensive catalytic converters. Other chemical compounds were formulated to boost the octane rating of petrol. Unleaded fuel is not high octane fuel as you believe. Almost all the petrol sold today the world over is unleaded except for very few petrol stations around the world (i don't think nigeria is included) who sell leaded petrol and they clearly mark it out as leaded so you don't mistakenly put the leaded petrol into your modern car. In fact, the dispensing nozzle on a leaded fuel pump will not fit into the petrol receptacle of your modern vehicle. Unleaded fuel is not for high performance cars alone let alone being only for S series or AM whatever. Higher octane petrol are needed in engines with high compression ratios. The higher the compression ratio, the higher the chance of pre-ignition and detonation which could be catastrophic for the engine. Lastly, the higher octane petrol does not supply the oxygen for combustion; atmospheric air drawn into the combustion chamber through your air intake manifold does.
Honda and Acura cars often have engines with high compression ratios sometimes greater than 10:1. With compression ratios this high, low octane petrol will pre-ignite from the immense pressure in the cylinders. The engine management system detects this as knocks and retards the ignition timing which leads to a loss in power. This effect is what the OP noticed. It goes away once you fill up again with a higher octane petrol. Toyotas seem to be immune from this effect because most toyota engines run with moderate compression ratios. My 1.6 litre honda has a higher compression ration ratio than my toyta camry so i am particularly careful about where i buy my fuels for the honda. I refuel the honda at only Total filling stations.

Emperoh:

Could this be the reason why my Lexus is throwing up the Malfunction Indicator Lamp saying that my Catalytic Converter efficiency is below threshold?

All the car needed was to take a trip from Lagos to Abuja and that came up instantly. I am already planning on doing a CC change. Which is quite pricey.

What are your thoughts?

9icetoo:
Maybe, but that may not be the reason too. Failing pre and post cat 02 sensors sometimes make the ECU think the cat is failing when it isn't. You will need a good auto shop to check out your pre and post 02 sensors to confirm if they are still working within spec. If they are and you do not have any leaks, then you have to change your catalyst. If it is indeed your catalyst, then the quality of fuel here might have contributed to its early demise. If you are in Abuja, you can seek out the counsel of Ikenna or Car Doctor, they'd be of good help. Don't gut out the cat yet until you confirm.

9icetoo:
I agree that anything that isnt desired in a mixture is an impurity. However, lead does not decrease the octane rating of petrol. Before the eighties, petrol was sold with lead in it to prevent detonation> The lead content actually acted as an octane booster. The advent of catalytic converters made lead in petrol undesirable cos of the negative effect it had on the expensive catalytic converters. Other chemical compounds were formulated to boost the octane rating of petrol. Unleaded fuel is not high octane fuel as you believe. Almost all the petrol sold today the world over is unleaded except for very few petrol stations around the world (i don't think nigeria is included) who sell leaded petrol and they clearly mark it out as leaded so you don't mistakenly put the leaded petrol into your modern car. In fact, the dispensing nozzle on a leaded fuel pump will not fit into the petrol receptacle of your modern vehicle. Unleaded fuel is not for high performance cars alone let alone being only for S series or AM whatever. Higher octane petrol are needed in engines with high compression ratios. The higher the compression ratio, the higher the chance of pre-ignition and detonation which could be catastrophic for the engine. Lastly, the higher octane petrol does not supply the oxygen for combustion; atmospheric air drawn into the combustion chamber through your air intake manifold does.
Honda and Acura cars often have engines with high compression ratios sometimes greater than 10:1. With compression ratios this high, low octane petrol will pre-ignite from the immense pressure in the cylinders. The engine management system detects this as knocks and retards the ignition timing which leads to a loss in power. This effect is what the OP noticed. It goes away once you fill up again with a higher octane petrol. Toyotas seem to be immune from this effect because most toyota engines run with moderate compression ratios. My 1.6 litre honda has a higher compression ration ratio than my toyta camry so i am particularly careful about where i buy my fuels for the honda. I refuel the honda at only Total filling stations.

sleekman: who says lead doesn't reduce d octane content of petrol? Where did u get that from? Lead makes d petrol lighter. Higher d lead content d lower d octane level.

9icetoo:
I guess you didn't read my post very well. Firstly, lead is one of the heavy metals and a very heavy element. Look up the atomic mass of lead (Pb) on the periodic table. It cannot make anything lighter. Secondly, Wikipedia and Google are your friends. If they aren't yours, they are mine. Google 'leaded fuel' and assimilate the knowledge. You can also check octane rating of petrol while you are there. Lead was added before the eighties to increase the octane rating of petrol. After the eighties, other compounds were introduced to replace lead in petrol. These compounds did the same thing lead was supposed to do and that is increase the octane rating of petrol. The higher the octane rating, the less likely it is for the petrol to pre-ignite and the more advanced an engine can be timed.

Emperoh:

The bolded is the only person who has worked on the car.
We have brought down the CC to see if the indomie was still in there, and it was positive. We washed it and fitted it back and cleared the codes which came back after 2 days driving.

But something also is worthy of note. We checked the reading of the O2 sensors and the post O2 sensor readings where quite or way above normal. something in the region 3.0..... others where with 0.8 to 1.0.

I don't know whether this could be a pointer to the issue.

9icetoo:
I am not too conversant with 02 values. You might want to swap in a fairly used post cat 02 sensor to check if that will clear the problem. If it does, then you can start saving up for a new one. Please make sure you buy the sensor with the correct part number or same part number as the one you are replacing.

Ikenna351: Last month, I Drove into NNPC fuel station at Zone 1, Wuse (not mega station) to refuel. Saw a guy who just bought a fuel in a white can on one of the pumps. The fuel color was dark red, meaning Lead fuel (bad for EFI system). I quickly turned round and drove out.

Unfortunately, I have been buying fuel from that station. Never knew what I was buying until that day. Now my 2 upstream sensors of my SV D9 are dead. Reason has become obvious to me.

Ikenna

sleekman: Why all these misinformation. If d fuel is real pinkish then that's our 9ja fuel straight from our refineries. They are d best cos it unleaded and d octane content is very high. This means ur engine delivers much better optimally with our fuel. In d west there is leaded and unleaded fuel with a remarkable difference. So please check ur engines or fuel tanks.

klodike: Pls i need clarification. What is the colour of lead and unleaded fuel respectively.

9icetoo:
The color you see are probably dyes or colors from the additives added to the petrol such as detergents (Not omo and klin oo, lol). Petrol in its natural state is colorless. I do not know the color of leaded petrol but I do not think all pink petrols are leaded petrol.

chiebube:
what of Abuja?