Blacktops when cold

[Lanius]

when it is doing it badly your cant accrelate at all, some times i have to pull over to let traffic pass

so its not a matter of pushing it to hard when cold

Wow, mines nowhere near as bad as that

[Mr Revhead]

yeah id say you have a real problem, not what we are talking about

[demis]

i think it is related

[astrae]

Has anyone worked out whats causing this?

I bought my car from a dealer in Jan 05. I noticed it hesitating at about 3-4 rpm when warming up. Sometimes it was a slight hesitation and others it would hardly accelerate at all.

I took it back to the dealer and it had 3 days at the Auto electrician. Of course by the time I got it down there it was hot and wouldnt do it. It took 3 days of testing and they found a problem with the oxygen sensor.

This was replaced with a brand new Toyota part. It never did it again...

Till now.

In the last week it has started doing it again. Sometimes a slight hesitation. Other times it wont go past 4k rpm. Its almost feels like a rev limiter.

If I take my foot off the gas a few times it normally sorts itself out and won't do it till next time the car is cold. If I leave my foot where it is, the revs just stop climbing. Tonight it took about 10 seconds to pull away. THis is with only a small amount of throttle.

It is definitley not a miss fire. I'm sure its related to fuel and the oxygen sensor leaning it out? or something along those lines. I did think the knock sensor at one time but dont know how much this could effect things?

My car is a 96 BZG, engine pretty much standard. K& N panel filter (factory when I first had the prob) leads & plugs checked by auto elect.

I cleaned the throttle bodies yesterday, no change (like i did the first time)

The dealer paid the auto electician bill the first time... I cant afford to go back.

Anyone got anymore ideas

cheers

[Chickenman]

Has to be ECU related? Feels like it's retarding the timing for some reason.
I got sick of it so I just sit there until it comes off high idle before I go anywhere. Finishing work at 11pm doesn't help either.


Anyway,

Still getting a bit of detonation occasionally on 98, has anyone knocked the timing on a BT back a degree or two and noticed a difference?

[matt dunn]

Still getting a bit of detonation occasionally on 98, has anyone knocked the timing on a BT back a degree or two and noticed a difference?

I run mine a couple lees than factory, but we only run 96 ( or is it 95 now?)

Matt

[astrae]

Still getting a bit of detonation occasionally on 98, has anyone knocked the timing on a BT back a degree or two and noticed a difference?

I run mine a couple lees than factory, but we only run 96 ( or is it 95 now?)

Matt

I've only ever run mine on 98...

[matt dunn]

Still getting a bit of detonation occasionally on 98, has anyone knocked the timing on a BT back a degree or two and noticed a difference?

I run mine a couple lees than factory, but we only run 96 ( or is it 95 now?)

Matt

I've only ever run mine on 98...

Untill now we could not Get 98 here, and now there is only a select few that have it.

Matt

[ROBODISCO_20v]

I am asuming you guys warm your cars up before you drive them
My first toyota an AE92 FXGT used to run pretty bad when cold so I let it warm up for a few minutes one day before I drove it & problem solved. I've scince done it with all my cars & have never had a problem with hesitation or miss firing. I just asume 4AGE's dont like being driven when cold.
In some casese here though it probably has something to do with faulty temp sensors or thermostat being stuck open

[astrae]

I am asuming you guys warm your cars up before you drive them
My first toyota an AE92 FXGT used to run pretty bad when cold so I let it warm up for a few minutes one day before I drove it & problem solved. I've scince done it with all my cars & have never had a problem with hesitation or miss firing. I just asume 4AGE's dont like being driven when cold.
In some casese here though it probably has something to do with faulty temp sensors or thermostat being stuck open

The funny thing is mine doesnt seem to do it when dead cold. It does it more often if I come back to its semi warm. Last night the temp guage was at a 1/4.

[malc]

Just thought I would add, mine does it too.
A split second hesitation every now and then
mine is a 97 bz-g
I test drove another before I got mine, the other one did it worse, which was part of the reason why i didnt buy it. The car had been driving for at least half an hour before I drove it so it wasn't an issue of not being warmed up.

[AceSniper]

could be the o2? I put a new one in awhile back an it ran better but now its giving lean readings to the ecu again (my guess carboned up) meaning the ecu's throwing alot of fuel on that isnt needed

[demis]

i was thinking it was somthing to do with the temp sensor for the ecu as mine seems worse in the winter months, to me it seems to be adjusting the timing when it is hesatating again mine dosent have to be stone cold
some times it will do it after leaving the car for about 10 min after a long drive

[dotdog]

Sweet, swaping the sensors round should prove if its a electical fault. Mine seems really bad at the mo with all the cold arse wheather, would be real nice to find the problem now

[QikStarlie]

dotdog: just put a 2et in it man

[MR2SIK]

Its not just the blacktops doing it, Over the past month or so my 1990 3sgte has been doing the samein the mornings on my way to work, always sorts itself out within a few minutes tho, pressing down on the accelerator gave the same effect as driving with a blown knock sensor, boost goes up, induction noise is loud revs hardly climb and speed doesnt.
and for the record i normally stay off boost for the whole trip to work in the mornings, its just been feeling sluggish lately so when i put my foot down to compensate, i noticed this...

[RomanV]

My old gen 2 3S in my MR2 did exactly the same thing some times.
I thought it perhaps had something to do with the fact that it had worn valve stem seals. (Anyone else here with problems, notice a puff of smoke out the exhaust on start up? much oil consumption?)

So I figured that the spark plugs were getting gunked up, and it wasnt firing all too well.

[astrae]

I've just been back to the auto electrician where my car went when the O2 sensor was first replaced. They said its unlikely it could be the o2 sensor with only 25,000 km on it.

THey said it sounds more temp sensor related.

Demism the price of my o2 sensor was about $360 + gst. That could be trade price as the dealer paid for it.

I'm going to to a bit of maintenance this week (plugs, fuel filter) and have it booked in at the auto sparky on monday. Hopefully I can sort out what the prob is before then. $67 an hour at the sparky...

[AceSniper]

Demism the price of my o2 sensor was about $360 + gst. That could be trade price as the dealer paid for it.

hate to tell ya but revhead can do them for less than half of that

[astrae]

Demism the price of my o2 sensor was about $360 + gst. That could be trade price as the dealer paid for it.

hate to tell ya but revhead can do them for less than half of that

doesn't matter to me, I didnt have to pay for it, the dealer did. If it does turn out to be the problem I might get in contact with him.