₦airaland Forum

Its not a tranny issue. the tranny scan might come up with nothing. He shld scan d power train.

my guess Wld be the fuel system.

GAZZUZZ:
You forgot to mention the TPS issue.

Thanks Gazzuzz and Cardoctor

Its not that I forgot about the TPS. I would say I got carried away talking about the issues that evade the mechs cos the first thing they rush at is the TPS.

In fact, most GDIs with driveability issues that I've worked on have had their TPS replaced more than once or twice yet that didn't solve the problem.

Though the TPS should not be overlooked when troubleshooting a GDI system but faults with it which are not hard to detect, do not occur as frequently as the ones listed in the starting post.

I have often seen a lot of complaints here about GDI engines, with owners resorting to replacing a GDI engine with the non-GDI while some owners sell their vehicles off out of disappointment and frustration. This made me pick a keen interest in these engines, seeking to know what it is about them that eludes our auto technicians and mechanics in this country that make us often fail to keep vehicles with GDI engines on the road.

Mention Mitsubishi brand that has a GDI to a regular mechanic and the reaction you would get is “Ahhhhhh! The motor ehn, na problem moto oh!” …but why? …one mechanic even told his client to go and start fasting and praying. And I asked him: …”is there any part in this engine that wasn’t made by man?” To answer that question very well for myself, this was what I did… -I walked into one of the mechanic’s workshop which had a neat Mitsubishi space wagon parked in its premises for almost a year. Long story short, I paid for the 7seater minivan and started working on its 4G64 GDI engine right there and was able to get the engine running in 7 hours.

The common problem these GDIs develop after about a year of using it is its inability to rev well, causing serious drivability issues. That was the same problem with the one I acquired.

After a few minutes of observing the fuel system on the vehicle and research, I realized that the GDI system needs two different kinds of fuel pumps to work well.
1. The primary intank fuel pump: Located inside the tank as usual and is electrically operated. Its job is to pick fuel from the fuel tank to the secondary fuel pump.

2. The secondary High Pressure Fuel pump: Located on the engine head and driven by the intake camshaft. This pump receives fuel from pump1 and multiplies the fuel flow pressure. Most drivability issues experienced by GDI owners is caused by failure of this pump to maintain the required pressure in the fuel rail.

The only reason this pump fails so frequently in Nigeria is Engine Oil Abuse.
a. Using oil specifications other than the factory specification for that particular engine.
b. Skipping oil changes.

Another evasive problem is Carbon buildup on intake valves. This is a common and regular problem with the GDI engines. Due to modern Unburned Hydrocarbon (UHC) regulations, vapors from the crankcase are usually vented into the intake stream in order to prevent oil droplets from escaping through the exhaust. In a port injection engine, these droplets are ‘washed off’ the neck of the intake valve by a relatively constant stream of gasoline droplets. In a GDI engine, the gasoline doesn’t touch intake side of the valve. As a result, the droplets have a tendency to bake onto the valve and significantly reduce performance. To add to this effect, many advanced GDI engines also include exhaust gas recirculation in order to lean out the combustion mixture and reduce in-cylinder temperatures for certain combustion modes (reducing NOx emissions). Since GDI combustion has the ability to produce far more soot than premixed combustion (port injection), the problem is magnified, causing symptoms that range from low engine rev, rough engine running and general drivability issues.

Please, feel free to post any issues concerning your GDI powered engines, let’s talk about it.

I vote vizkiz Cc: NLjega

Ouch!

charlsecy:
I am considering Mitsubishi Space Star. What can you tell me about it?

Nice car.

Mitsubishi engines are sensitive to engine oil specifications, so you have to adhere to factory spec engine oil for servicing or you would lose the engine earlier than expected. especially if you buy one equipped with a GDI engine.

Stick to a regular oil change interval of at most, 3months depending on the quality of engine oil you use and you are good to go.

cheers.

ruffneck75:
Hi all,

My 2013 wrangler Sport has been having issues with parasitic draw.The only way to ensure it runs every morning is to disconnect the battery after driving it. Any suggestions on how to solve this issue.

How long have you used that battery?

The fix might just be as simple as getting a new one

Please, who knows where I can find the above named here in nija? the air suspension in the car in question is bad and owner wants a conversion. pls Holla me ASAP 08030938491

Siena, Gazzuzz, pls say something.

How many women are even interested in this gender equality bullshit? it ain't gon change a thing.

airfresher:
Please my good people in the house, help me out on this issue,I have a citreon evasion 1.8i 1998 newly rebuilt engine.For the first time we want to start it it refused to start,first we thought that is fuel pump,but the fuel pump is ok. The mechanic just told me that there is no current in the plugs,which may be reason why fuel pump not getting current too.So he said we will look for a rewire that will check the problem.but i want to get first hand information here before meeting the rewire,so that when he start speaking latin i will know where to wait for him.please i need advice on this.

Your crankshaft sensor is most probably the culprit. mech must have damaged it while trying to fix the timing belt or chain.

charlesadeoye:
Bro. No hard feelings but you got it all wrong saying the honda comes with a 3.0 liter engine (get your facts right before advising someone who came up asking for your advise)and do you think quest seems to be most advisable out of these 3 minivans which should be used as transport?leaving the fact that vehicle has been plagued with different problems.I dont drive an oddyssey neither a quest or a mpv but i have had my experiences working on them. Like i said. Stay out of the quest@op. I wouldnt want you purchasing a vehicle that you either end up having sleepless nights on

please, which year of Odessy do you have in mind?

I currently drive a quest and I can trust it to the moon. I have clients who use the odessy and the MPV. I'm not here to exchange or words argue with you. The point I am trying to make here is that when you have a correction to make, pls go ahead and do that. You should not tell me that I don't know what I am saying. Are we fighting over something?

cruzita:






I'm seeing Michael Jackson ,Nelson Mandela,superman etc.



are they in heaven too?

Lol! @ Superman in heaven. You funny oh

But why una de always sensor their shameless faces?

charlesadeoye:
Well my oga, the oddyssey comes with a 3.5liter J35a engine that produces close to 240hp,(known for transmission failures but stands the test of time if well maintained with the right fluid) compared to the mpv. The mpv comes 3.0 AJv6 engine. (The least powered of all the vans listed here). The quest comes with VQ35DE engine found in murano and the likes. The quest is a thirsty van plagued with many problems. Like most people have mentioned the sienna would have been the best. But out of this them all. I would give it to the oddyssey, (cheaper parts than others and comparing gas mileage with the power it delivers makes it outstanding).placing gas mileage vis a vis power in mind.
@op. In a nutshell. If you are looking for power and economy. The oddyssey is the van but looking for more economical and moderate power. I advise you go for the MPV. But i will never advise you to buy the quest. My two cents

Imagine after all you have typed to air your view, I quote you and say "you don't know what you are saying" ...just cos I have a different opinion from urs.

You have had ur experiences with these vehicles and I've had mine. You are free to disagree with what I have said but pls never tell me that I don't know what I'm saying.

charlesadeoye:
You dont know what you are saying....

Oya, lecture me about my own opinion

To recall that on my birthday this year, I sat before a panel of inquiry in Lagos. It wasn't funny but God remained God.

Wishing us all many happy returns

I used that road on Friday and had to tow my car back to the workshop. till now I'm still working on it.

FullDepth1:
This @Siena guy is an online Bully. LMAO!

Not at all. Siena is no where close to being an online bully.

Imeobong:
@ Siena, where can I get this compressor?

hahahahahahahahahahaha!

So you want to put bulldozer compressor in your Toyota corolla?

Op, Siena is being sarcastic, making jest of the Peugeot compressor idea.

The idea will work oh but you will soon find yourself asking for the best engine that can carry that Peugeot compressor. lolz! ...maybe then, ur farmer mechanic will suggest keke engine.

Pls stick with the same kind of compressor that came with ur car.

Elsafema:
pleas any good mechanic in Ibadan

Probably a shift solenoid code. must have been as a result of the technician not properly connecting all sockets he removed while working on ur compressor.

There's no cause for alarm. just go back to the guy and ask him to recheck all connectors he touched while working. make sure he disconnects a battery terminal before the check. then let us know how it went.

cocoduck:
hehehehehehehe
that guy dey take person for a fool

Ok, I've seen you.

cocoduck:
hahahahahahahahafafafafafafa

Abeg, Wetin happen?

ptoall1000:
Is there any good Honda mechanic in abuja who can handle it?

Find kingreign. 07034581213

charlie44nike:
Please Nairalanders. My radiator fan does not kick in on time, it works like it has a mind of it's own. I always have to turn my airconditioner on before the fan blows.

The car is overheating, its a 1999 Volvo s80. I have called a mechanic in ladipo, and they said they have to relay the fan to work direct, which means they have to hotwire the fan to the battery, it wouldn't work with the thermostat anymore.

Please i want to know if this proposed method will not have any effect on water flowing into the engine when the thermostat won't be working anymore.

Please someone help me before i ask them to proceed.[b][/b]

pls note that the thermostat responsible for starting the fan is not the same one in the engine.

fan starting thermostats are usually located on the radiators while in some other vehicles, the main temp sensor or a secondary temp sensor does this job.

Ask your electrician to check your radiator fan relays. it cld be that one of them is burnt. just yanking out the engine thermostat will get you no result.

morningsta:
Hello Nairalanders,

I noticed recently that my gear stick has become slightly stiff and not as smooth as it use to be when changing gears. The car is a Nissan X-Trail, 2008 Model and automatic gear. What can be the issue and how can I fix it pls? my mechanic does not seem to understand it.

thanks in advance for your valued and experienced suggestions.

First of all, check the cable that goes from the shift lever to the transmission. ask your mech to find a way to lubricate it. if the situation improves, then you shld change that cable.

GAZZUZZ:
he will not race ford transit busses.

lol!

I support Gazzuzz's opinion. but if symptoms persist after a few days please consult a Gazzuzz.

Denn:
There is an error I have noticed in the postulations on radiators.

There is absolutely nothing wrong with a double cell radiator.

In fact, I will advise you use a double cell radiator asap.

My facts are stated below;

The operating temperature of the engine is not determined by the size of the radiator but the opening temperature of the thermostat.

In fact if your radiator is as big as a geepee tank, as long as your thermostat is Installed and it opens as when due, your engine will run at an optimal temperature.

The problem with radiator size comes into play if :
*your thermostat has been deleted.
*your cooling fan is not operating at default setting
*there is a problem with any other component in the cooling system.

Double cell radiators enhance the speed at which the coolant gets cooled since it offers more surface area for the air to pass over.

With our high ambient temperature, we need double cell (or even triple cell) radiators as a cooling system upgrade.

Do not delete your thermostat no matter what you do. If your car cannot cool with the thermostat in place, there is a problem.

Thanks

Cc orex

Hmm...

I concur.

uncleGb, what Gazzuzz is tryn to say is that you might have to import the single cell radiator by urself... BTW, for inside which market you been de find am?

oloriooko:
If its a meteorite the effect of the impact will be more devastating than this

Did you put the size of the meteorite into consideration?

pearly1:
Abuja

call Lomomike 07034581213