running like crap!!
18 February 2007, 05:13 PM
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running like crap!!
hi all
ive got a 93 import 240hp with mods
put in z4 ecu in car on the first run more boost ran smoother.
the same evening took car out again this time car was holding back through
gears and no boost..used 97 ron then.
trip to bristol filled up with v power... still running rough and lumpy
this morning took out the z4 ecu and replaced with my u8 ecu . running smoother again but still hardly any boost through the gears...engine now sounds abit tappy still not running as should dont understand whats
happened here
any help please?
z4 should run smoother and boost???
ive got a 93 import 240hp with mods
put in z4 ecu in car on the first run more boost ran smoother.
the same evening took car out again this time car was holding back through
gears and no boost..used 97 ron then.
trip to bristol filled up with v power... still running rough and lumpy
this morning took out the z4 ecu and replaced with my u8 ecu . running smoother again but still hardly any boost through the gears...engine now sounds abit tappy still not running as should
dont understand whats happened here
any help please? z4 should run smoother and boost???
18 February 2007, 09:57 PM
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Have you reset the ECU and checked for any codes? Could try cleaning all boost associated vacuum hoses, boost solenoid etc with brake cleaner. Are the vacuum pipes standard or silicone?
Had a similar problem on my 93 WRX, with the U8 fitted my boost was very hesitant or on/off. Turned out that one of the silicone pipes wasn't right, the one with the brass restrictor from the bottom of the Boost solenoid, the hole in the restrictor was too small and needed opening to 1 - 1.5mm (go careful if you do this, bit at a time). The car was like it when I bought it, and I only noticed the fault when I tried to up the boost and nothing happened. My car was not rough or lumpy though, a bit tappy maybe but these engines can be.
Just swapping fuels won't make any difference in the short term as these ECU's do not learn very quickly, they need a reset if you want results quickly. I would really get to the bottom of the cars troubles first though. An accurate boost gauge would also be useful as then your are not working blind.
https://www.scoobynet.com/general-te...-question.html
Read the last couple of pages in this link, it may help you. I got some very useful help when I needed it. There is some very knowledgable guys on here..
Had a similar problem on my 93 WRX, with the U8 fitted my boost was very hesitant or on/off. Turned out that one of the silicone pipes wasn't right, the one with the brass restrictor from the bottom of the Boost solenoid, the hole in the restrictor was too small and needed opening to 1 - 1.5mm (go careful if you do this, bit at a time). The car was like it when I bought it, and I only noticed the fault when I tried to up the boost and nothing happened. My car was not rough or lumpy though, a bit tappy maybe but these engines can be.
Just swapping fuels won't make any difference in the short term as these ECU's do not learn very quickly, they need a reset if you want results quickly. I would really get to the bottom of the cars troubles first though. An accurate boost gauge would also be useful as then your are not working blind.
https://www.scoobynet.com/general-te...-question.html
Read the last couple of pages in this link, it may help you. I got some very useful help when I needed it. There is some very knowledgable guys on here..
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