1g-gte misfiring on first few seconds of startup - common?

[TRD184]

check for trouble codes??

[gtz20]

hey bud had main lead off from coil to deter theft as i have no alarm etc
went to start my gz20 this mornin and forgot i had taken lead off a couple
days ago anyhow put lead back on when it started it had the same misfire
problem u r describing i can only put it down to a flooding problem is to much
fuel gettin through ? started car again 5 mins ago and not doin it again at all my gz20
has never had any misfire problems at all in the past or fuel issues

[VasH]

did you check the cold start/temprature sensor plugs like i suggested? mine used to hesistate until i cleaned em up.

[Z2TT]

Hi vash, Is it the green connector below the distributor, or is it the brown one?

Also I will have to begin ruling out whether it's a leaky HG or not, but it's my daily so It's hard to leave it sitting in the garage for a while, any other suggestions or is that the only way to rule out the slightly leaky HG?

Thanks.

[VasH]

clean up both.

[Z2TT]

check for trouble codes??

No codes...........

[Z2TT]

Very very slight BHG will do this but not show any real signs of BHG . Take the plugs out after a week of sitting and crank it and see if you have any moisture.
Dave

Hi,

I left my car for about 4 days since i didn't need to go anywhere, and when I started it up a puff of white smoke came out of the exhaust.

So could it be that small amounts of water that leak from the water gallery into the combustion chambers overnight be causing it to misfire when started, even if smoke isn't noticed when leaving it overnight and starting it in the morning, would small amounts of water cause this sort of hesitation?

Thanks.

[TRD184]

white smoke when starting it could just be condensation though, if it was that, the water/smoke out the exhaust would be apparent continuously?? (pretty sure)

[Z2TT]

Well when left for 1 day, and started no smoke will puff out but just like a small mist while it's cold.

When left for about a week sitting there, when I start it up there is a puff of white smoke, not huge though that bellows out, then after that just normal mist as normal while it's cold.

Thanks

[JZA70R_92]

white smoke = dont worry
blue smoke = possible oil leaking past valve stem seals.

My old GA would miss on first start up if ecu had been reset also does this in my MA70 with 7MGE regardless when its a cold morning and starting up you will aways see mist.

[Z2TT]

Hi,

Noticed another thing today.
If I turn the car on (cold or warm), then a second after turn on put it into D and drive, it would bog down until low oil pressure light shows up, sometimes it might even turn off.
If I wait like 3 or 4 seconds before putting it into D, drives normally. Just a bit weird.

Thanks.

[Z2TT]

did you check the cold start/temprature sensor plugs like i suggested? mine used to hesistate until i cleaned em up.

Today I checked these two plugs, I cleaned them out and plugged them back in.
Didn't help.

[lexsmaz]

I would be checking for leaking injectors or BHG ... How long does it misfire for ? on start up, a couple of seconds i would put down to fuel issue, If its around 10 - 20 seconds approx, i would be looking at a BHG ..

Checking for leaking injectors, can you remove the injectors from the car with the fuel rail connected or reconnect the fuel rail & power up the pump for a few seconds & then turn off & visually inspect the pintle area of the injector for wetness or dribbling, you don't need the injectors wired up though ... To power up the pump you can turn on the ignition & just open by hand the air flow meter flap slightly which will power up the pump .. The injectors should obviously stay dry the whole time .... If you can't do the above tests you might have to get them tested by someone ..

A head gasket leak will take a time to clear on start up as it has to burn / blow off the excess moisture which is inhibiting the combustion process & hence the longer misfire / rough idle .. Are you going through any amount of coolant ? The white smoke on start up does it have a sort of sweet smell ? When coolant is burn't it seems to produce a sweet kind of smell to the exhaust fumes ..

[Z2TT]

Hi,

It misfires for about 2 or 3 seconds, then shoots upto the normal idle.

I should be able to remove the injectors while they are still on the rail, so from what you told me put it on ignition, then push the AFM in and hold it in to keep the fuel pump going, then check for leaks.

I'll have to see about the smell of the smoke, as it only puffs some white smoke if i leave it for about 4 days without starting it, as for the hesitation on startup, It's ussually until the engine totally cools down.

[lexsmaz]

If its only for a short time like you said i would definately suspect fuel as the cause ..

Firstly before you pull the rails & injectors off, try this other method first ..Turn on the ignition, not sure how the Air filter is set up but basically just lift up the air flow meter or remove the air filter so you can get to the Flap & with everything still connected push open the Air Flow Meter Flap for a few seconds as i mentioned earlier which will fire up the fuel pump & so pressurise the rail, ( you should be able to hear the pump run & even feel the rubber fuel rails pressurise / expand if you squeeze them slightly between your fingers, just confirms that the pump is running ) Then put down the Air flow meter & just start the car as per normal & see how it starts up, if its perfect, as in smooth etc straight away, its possibly loosing pressure in the fuel system else where, but if its still rough take off the rails as in the other Method & check the injectors, When checking the injectors just run the fuel pump ( Via the air flow meter ) for about 5 -10 seconds & then release the flap & observe the injectors for a up to a couple of Minutes & they should stay / remain bone dry .. ( Obviously dont try & crank the car as the Injectors will start to spray & stuff up the test )

Have fun, hope thats all clear ..

Rob ..