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D22 Zd30 accelerator
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Old 16-09-2017, 10:34 AM
Mattheeley Mattheeley is offline
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Question D22 Zd30 accelerator

Hi. Today I test drove an 06 dx zd30 which my brother purchased today. The difference in acceleration was very noticeable compared to my 06 STR zd30. His pedal was way softer under foot and was alot more responsive than mine. I have a dp chip and 3inch exhaust, this dx is stock and feels so much smoother accelerating and seems to get up to speed quicker than mine. Has anyone experienced a crappy accelerator with poor response? I've had a look under there and doesn't seem dirty or rusty.
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Old 16-09-2017, 11:38 AM
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i doubt its the accelerator.
more than likely something like injectors or injection pump.
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Old 16-09-2017, 11:50 AM
Mattheeley Mattheeley is offline
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Thanks mate. Would it be pricey to get the injectors looked at? My zd30 has 110k on the clock so I'm hoping the pump hasn't failed yet.
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Old 16-09-2017, 01:34 PM
Mikevp44 Mikevp44 is offline
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I don't think the issue is either the pump or injectors not likely at 110kms. It is worth checking the air filter if you haven't checked it fir a while as I have seen gradually block up and restrict the air flow resulting in pretty ordinary performance.

Cheers and good luck
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Old 16-09-2017, 02:08 PM
Mattheeley Mattheeley is offline
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Quote:
Originally Posted by Mikevp44 View Post
I don't think the issue is either the pump or injectors not likely at 110kms. It is worth checking the air filter if you haven't checked it fir a while as I have seen gradually block up and restrict the air flow resulting in pretty ordinary performance.

Cheers and good luck
Cheers for the reply, air filter gets changed regularly along with fuel filter. I've checked all hoses for leaks and all seem normal. I have noticed the exhaust makes a funny sound when holding revs and has started to rattle on start up knocking on the leaf spring suggesting maybe exhaust has come a bit loose somewhere? Could this effect performance?
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Old 16-09-2017, 10:27 PM
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Old.Tony Old.Tony is offline
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I would think a loose exhaust (on the "far" side of the turbo) won't have that great an effect on performance. If it's between the turbo and exhaust ports (so head->exhaust manifold or manifold->turbo) then absolutely it will affect performance because you're losing pressure that would normally drive the turbine and thus you're losing boost. Having a boost gauge would help here.

As Mike says though, it's less likely to be pump or injectors - unless you've had some dirty fuel. Poor fuel quality can easily cause troubles with injectors. In our D40s the SCV (part of our fuel pump) is a prime candidate for failure from poor fuel.

So what I'd do first, before even thinking about pulling injectors or fuel pumps or anything else, is head down to your local auto parts place and grab a bottle of Liqui Moly Fuel System Treatment. Works in diesel and petrol engines. I've used it in my D40 (2.5L 4cyl turbo diesel) and my Honda Goldwing (1500cc 6cyl petrol). The stuff is almost like a mechanic in a bottle.

After you've run one of those bottles through the tank, see how the performance is.

Other things to look at: is there more smoke than before? Do you have a catch can? If your EGR is still functioning your intake manifold might be filled with black gunk from the combination of diesel soot (from EGR) and condensing oil vapour (from PCV).
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Old 16-09-2017, 11:25 PM
Mattheeley Mattheeley is offline
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Quote:
Originally Posted by Old.Tony View Post
I would think a loose exhaust (on the "far" side of the turbo) won't have that great an effect on performance. If it's between the turbo and exhaust ports (so head->exhaust manifold or manifold->turbo) then absolutely it will affect performance because you're losing pressure that would normally drive the turbine and thus you're losing boost. Having a boost gauge would help here.

As Mike says though, it's less likely to be pump or injectors - unless you've had some dirty fuel. Poor fuel quality can easily cause troubles with injectors. In our D40s the SCV (part of our fuel pump) is a prime candidate for failure from poor fuel.

So what I'd do first, before even thinking about pulling injectors or fuel pumps or anything else, is head down to your local auto parts place and grab a bottle of Liqui Moly Fuel System Treatment. Works in diesel and petrol engines. I've used it in my D40 (2.5L 4cyl turbo diesel) and my Honda Goldwing (1500cc 6cyl petrol). The stuff is almost like a mechanic in a bottle.

After you've run one of those bottles through the tank, see how the performance is.

Other things to look at: is there more smoke than before? Do you have a catch can? If your EGR is still functioning your intake manifold might be filled with black gunk from the combination of diesel soot (from EGR) and condensing oil vapour (from PCV).
Cheers for the info mate. I've looked around where the turbo and exhaust manifold are and see no evidence of any leaks although when under load I have noticed a hissing sound coming from the left hand side of engine bay. My boost sits at about 17 psi at full throttle. I'll give one of those bottles a go, is it just the one you add to your tank? No catch can installed, egr was blocked about 30000ks ago. I have noticed more smoke on start up with a puff of black smoke and also noticed I can smell the emissions alot more now.

Last edited by Mattheeley; 16-09-2017 at 11:36 PM.
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Old 17-09-2017, 06:04 AM
Mikevp44 Mikevp44 is offline
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It is also worth checking the exhaust flow at the tail end to check that their aren't any obstructions ie bent dented exhaust pipe, broken baffle blocking exiting gases or the catalytic converter being blocked as well.
Cheers and good
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Old 17-09-2017, 06:15 AM
Mikevp44 Mikevp44 is offline
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As an after thought the smell of emission gas and a puff of smoke indicates incomplete burning of fuel. Hate to say it and given the recent change of the injectors they are most probably fully atomising the fuel but if droplets were forming in one or more of the injectors that would account for the puff of smoke and loss of power. I would also check the egr/shut down actuator that is is fully opening after shut down to confirm the expected amount of air is getting into the cylinders. Pushing the actuator to the left hand side is fully open and that is were it should be and fully towards the right hand side is for shut down just in case if your nit quite sure.

Cheers

Mike
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Old 17-09-2017, 01:32 PM
Mattheeley Mattheeley is offline
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Quote:
Originally Posted by Mikevp44 View Post
As an after thought the smell of emission gas and a puff of smoke indicates incomplete burning of fuel. Hate to say it and given the recent change of the injectors they are most probably fully atomising the fuel but if droplets were forming in one or more of the injectors that would account for the puff of smoke and loss of power. I would also check the egr/shut down actuator that is is fully opening after shut down to confirm the expected amount of air is getting into the cylinders. Pushing the actuator to the left hand side is fully open and that is were it should be and fully towards the right hand side is for shut down just in case if your nit quite sure.

Cheers

Mike
Thanks mike, sounds like I might need the injectors looked at. Where on the engine would I find the shut down actuator? Sorry mate, I haven't got the greatest knowledge when it comes to this sort of stuff.
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