72 replies to this topic

[astravxr]

Since i bought the car the engine has been jumping/dropping every couple of seconds. Few month ago the lad at halfords showed me which spark plugs i needed, i changed them and no difference. Today i put some NGK iridium spark plugs in from the old astra and now the problem has gone I have a problem with performance though. When im stopped and i try to pull away fast, no matter how well do it the car pulls, dies and then pulls again as if i've got traction control and forth gear seems more responsive than 2nd and 3rd. 2nd gear feels like 5th. Will this be crap mapping? Thorney stage 2 map

Edited by astravxr, 18 August 2011 - 01:54 PM.

[smiley]

I'm not a tubby expert in any way, but have heared that the (plastic) air intake pipe can collapse under pressure when putting your foot down. Can you inspect that pipe to see if the plastic has come together in any way? See alloy intake pipe section for a substitute: http://www.courtenay...bo/info_22.html

Edited by smiley, 18 August 2011 - 02:34 PM.

[rob999]

I'm not a tubby expert in any way, but have heared that the (plastic) air intake pipe can collapse under pressure when putting your foot down.
Can you inspect that pipe to see if the plastic has come together in any way?

See alloy intake pipe section for a substitute:
http://www.courtenay...bo/info_22.html

I'm sure we've mentioned it previously but that'd be my bet. Especially under load and if it's after some amount of time.

[astravxr]

I'm not a tubby expert in any way, but have heared that the (plastic) air intake pipe can collapse under pressure when putting your foot down.
Can you inspect that pipe to see if the plastic has come together in any way?

See alloy intake pipe section for a substitute:
http://www.courtenay...bo/info_22.html

I dont understand? I thought that pipe was rubber, there is a sort of cover on the outside of it which looks ripped. How would i check to see if this is the problem?

[starlight]

Mapping should be ok as many others have TMS stage 2. Is this happening only when the car is fully warm? As it only seems to be happening in lower gears, could it be high air intake temperatures - not high enough air flow through the air/air charge cooler to lower inlet charge temps? is this happening having come to a halt after some spirited driving? If it is the collapsing of the intake pipe, why does it only happen in the first few gears???

[astravxr]

Mapping should be ok as many others have TMS stage 2. Is this happening only when the car is fully warm? As it only seems to be happening in lower gears, could it be high air intake temperatures - not high enough air flow through the air/air charge cooler to lower inlet charge temps? is this happening having come to a halt after some spirited driving?

If it is the collapsing of the intake pipe, why does it only happen in the first few gears???

It happens all the time mate, im not sure what it is im not good with engines. Sometimes i've seen the engine temp go to 92/94 when sitting for so long at idle like mc donalds drive through or something and usually the temp sits at 86 when driving normal. How would i check the intake pipe?

[astravxr]

This is the only pic i have of my engine but the intake pipe has a sort of softish plastic around the pipe, you cant see it because of the heat shield but its all torn behind there?

[Goosenka]

Mapping should be ok as many others have TMS stage 2. Is this happening only when the car is fully warm? As it only seems to be happening in lower gears, could it be high air intake temperatures - not high enough air flow through the air/air charge cooler to lower inlet charge temps? is this happening having come to a halt after some spirited driving?

If it is the collapsing of the intake pipe, why does it only happen in the first few gears???

It happens all the time mate, im not sure what it is im not good with engines. Sometimes i've seen the engine temp go to 92/94 when sitting for so long at idle like mc donalds drive through or something and usually the temp sits at 86 when driving normal. How would i check the intake pipe?

Temps seem normal...mine was at 104 yesterday in traffic??? Not sure about McD's drive thru though....could be the reason for the temp rise

[astravxr]

Mapping should be ok as many others have TMS stage 2. Is this happening only when the car is fully warm? As it only seems to be happening in lower gears, could it be high air intake temperatures - not high enough air flow through the air/air charge cooler to lower inlet charge temps? is this happening having come to a halt after some spirited driving?

If it is the collapsing of the intake pipe, why does it only happen in the first few gears???

It happens all the time mate, im not sure what it is im not good with engines. Sometimes i've seen the engine temp go to 92/94 when sitting for so long at idle like mc donalds drive through or something and usually the temp sits at 86 when driving normal. How would i check the intake pipe?

Temps seem normal...mine was at 104 yesterday in traffic??? Not sure about McD's drive thru though....could be the reason for the temp rise

lol. usually sitting in there for 10+ minutes

[Wolfstone]

I see you still haven't fixed your insecure fuel line I mentioned a couple of months back. Its a 5 minute fix astra but you run the risk of a major fuel leak which in turn will have a high propensity to ignite given it sits so close to the exhaust. Believe me, it's worth sorting. I was very fortunate mine didn't go up in flames. Unless of course this is an old pic and you've secured it since.

Edited by Wolfstone, 18 August 2011 - 03:41 PM.

[astravxr]

I see you still haven't fixed your insecure fuel line I mentioned a couple of months back.

Its a 5 minute fix astra but you run the risk of a major fuel leak which in turn will have a high propensity to ignite given it sits so close to the exhaust. Believe me, it's worth sorting. I was very fortunate mine didn't go up in flames.

Unless of course this is an old pic and you've secured it since.

Yeah its an old pic, i've fixed since. This pic was from when i first bought the car

[Wolfstone]

Yeah its an old pic, i've fixed since. This pic was from when i first bought the car

Phew! Good man.

[Wolfstone]

I think I can just see a tear in it to the left of the heatshield. That'll most likely be your problem.

[astravxr]

So is there a way to check if the pipe is collapsing?

[astravxr]

I think I can just see a tear in it to the left of the heatshield. That'll most likely be your problem.

Behind the heat shield there is a lot of it teared. What does the hard bit of plastic do and this should be the problem?

[smiley]

Behind the heat shield there is a lot of it teared. What does the hard bit of plastic do and this should be the problem?

It's a plastic inlet pipe, that let's air into the engine.
The airbox is at the end of it, on the left, and get's the air from the outside, via that ear that sticks out of the car.
If it collapses or has, you could see small teares in it or other signs that show it's no longer fresh.

You should be able to take it off completely for a more close inspection very easy.

Edited by smiley, 18 August 2011 - 04:01 PM.

[astravxr]

Behind the heat shield there is a lot of it teared. What does the hard bit of plastic do and this should be the problem?

It's a plastic inlet pipe, that let's air into the engine.
The airbox is at the end of it, on the left, and get's the air from the outside, via that ear that sticks out of the car.
If it collapses or has, you could see small teares in it or other signs that show it's no longer fresh.

You should be able to take it off completely for a more close inspection very easy.

Sorry mate i know what it does, i just dont understand how it would collapse if air is rushing through it. Also its not the pipe thats ripped its the harder bit of plastic around it thats teared... im guessing this is whats helping to stop the collapsing, is it stuck onto the pipe?

So if i take the pipe off what am i looking for?

Edited by astravxr, 18 August 2011 - 04:04 PM.

[smiley]

So if i take the pipe off what am i looking for?

Wait for someone to step in, who actually knows more about tubbies, and these tubes for more detailed explanation.

[Boombang]

How new is the air filter? Any dirt in that will make things worse as is a further restriction. When turbo spools up, it sucks air in. That pipe has an air filter on the end so is restricted. This creates a vaccuum and the pipe gets sucked in on itself, cutting off air and killing engine. Try squeezing the pipe when it's all hot, if it's really soft then chances are it is at least partially collapsing.

[Boombang]

Also I was not aware of any gear sensor that fed back to the ECU - so the ECU has no way of knowing what gear you are in and therefore cannot alter the map. Checked recently for error codes?