Car doesnt run after install... Help please
Dec 6, 2005, 01:14 PM
#1
Car doesnt run after install... Help please
ok so this is the short story. I installed a new transmission and clutch and whatnot. I removed the Evap stuff and both bumpers and installed the MAFT Pro (Alongside with the Utec). When I fired the car it sorta ran on its own surging from 1k-2.2k. After it warmed up a bit the car started to want to die so I helped it with the throttle. It got to the point where it would die without 20-30% throttle. All of the parameters were set per the instructions and I can see all the variables and they seem to be correct (Aside from the AFR... for some reason it isnt reading the Zietronix wideband.. i have it set to number 5 which should be for the Zietronix unit but it still doesnt read anything at all). I am stuck at work now and I will be here until Thursday but on Thursday I will unplug the MAFT Pro and put the MAF back in it and see if the car runs like that and I am assuming it will. I can not seem to figure out why this is happening though... the hertz values it is sending out 'seem' to be correct.
The cars symptoms are it wont idle on its own, with me holdling the throttle it still surges alot. If I try to move the car if surges very hard and backfires and stuff and the AFRs are around 10:1 when cruising and I can not seem to get them much higher through the UTEC. I have no idea on whats wrong with the car. Any help would be appreciated. I just dont understand how much people just plug it in and it works but mine doesnt at all.
The cars symptoms are it wont idle on its own, with me holdling the throttle it still surges alot. If I try to move the car if surges very hard and backfires and stuff and the AFRs are around 10:1 when cruising and I can not seem to get them much higher through the UTEC. I have no idea on whats wrong with the car. Any help would be appreciated. I just dont understand how much people just plug it in and it works but mine doesnt at all.
Dec 6, 2005, 01:18 PM
#2
Originally Posted by TrinaBabe
ok so this is the short story. I installed a new transmission and clutch and whatnot. I removed the Evap stuff and both bumpers and installed the MAFT Pro (Alongside with the Utec). When I fired the car it sorta ran on its own surging from 1k-2.2k. After it warmed up a bit the car started to want to die so I helped it with the throttle. It got to the point where it would die without 20-30% throttle. All of the parameters were set per the instructions and I can see all the variables and they seem to be correct (Aside from the AFR... for some reason it isnt reading the Zietronix wideband.. i have it set to number 5 which should be for the Zietronix unit but it still doesnt read anything at all). I am stuck at work now and I will be here until Thursday but on Thursday I will unplug the MAFT Pro and put the MAF back in it and see if the car runs like that and I am assuming it will. I can not seem to figure out why this is happening though... the hertz values it is sending out 'seem' to be correct.
The cars symptoms are it wont idle on its own, with me holdling the throttle it still surges alot. If I try to move the car if surges very hard and backfires and stuff and the AFRs are around 10:1 when cruising and I can not seem to get them much higher through the UTEC. I have no idea on whats wrong with the car. Any help would be appreciated. I just dont understand how much people just plug it in and it works but mine doesnt at all.
The cars symptoms are it wont idle on its own, with me holdling the throttle it still surges alot. If I try to move the car if surges very hard and backfires and stuff and the AFRs are around 10:1 when cruising and I can not seem to get them much higher through the UTEC. I have no idea on whats wrong with the car. Any help would be appreciated. I just dont understand how much people just plug it in and it works but mine doesnt at all.
Dec 6, 2005, 01:34 PM
#4
Originally Posted by TrinaBabe
Well I tried switched to the stock MAP on the Utec and it still didnt change anything. With the UTEC on map zero it should just be a passthrough device with no parameters. How do I scale the injectors on the MAFT Pro?
Dec 6, 2005, 01:40 PM
#6
I know the UTEC wont run properly without injector comp but I just dont see why it would run the exact same in either map. I figured by setting the Utec to stock I might be able to use the MAFT Pro to start to fix itself. But in any rate, with the UTEC adjusting for the injectors the MAFT Pro shouldnt need to or vica versa. hrmph... I guess I will first try to put the stock ECU back in and reconnect the airflow wire and see if it runs... if it does I at least know all I need to do is tweak the MAFT Pro...
I think my biggest problems are the mods on the damned car. It never really idled well before and now I am throwing another interpreter on it which I think is just confusing it to hell. The intake manifold is one of the big things I think may be throwing the VE table way off also.
And sorry for the questions but also whats with the AFR thing? I have it hooked up to the analog out from the Zietronix into the O2 input on the MAFT Pro. I have the MAFT Pro set to 5 (Which is zeitronix).
And by adjust it by the percent you mean since I have 750cc and the stockers are 550 I should adjust it about 26.67% up? Or do I do it down since the injectors are bigger?
I think my biggest problems are the mods on the damned car. It never really idled well before and now I am throwing another interpreter on it which I think is just confusing it to hell. The intake manifold is one of the big things I think may be throwing the VE table way off also.
And sorry for the questions but also whats with the AFR thing? I have it hooked up to the analog out from the Zietronix into the O2 input on the MAFT Pro. I have the MAFT Pro set to 5 (Which is zeitronix).
And by adjust it by the percent you mean since I have 750cc and the stockers are 550 I should adjust it about 26.67% up? Or do I do it down since the injectors are bigger?
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Dec 6, 2005, 01:45 PM
#8
Originally Posted by TrinaBabe
Also, are there instructions online somewhere? I would like to research some of the functions without driving back to the car which is 45 minutes away right now.
Dec 6, 2005, 01:56 PM
#9
Originally Posted by TrinaBabe
I know the UTEC wont run properly without injector comp but I just dont see why it would run the exact same in either map. I figured by setting the Utec to stock I might be able to use the MAFT Pro to start to fix itself. But in any rate, with the UTEC adjusting for the injectors the MAFT Pro shouldnt need to or vica versa. hrmph... I guess I will first try to put the stock ECU back in and reconnect the airflow wire and see if it runs... if it does I at least know all I need to do is tweak the MAFT Pro...
I think my biggest problems are the mods on the damned car. It never really idled well before and now I am throwing another interpreter on it which I think is just confusing it to hell. The intake manifold is one of the big things I think may be throwing the VE table way off also.
And sorry for the questions but also whats with the AFR thing? I have it hooked up to the analog out from the Zietronix into the O2 input on the MAFT Pro. I have the MAFT Pro set to 5 (Which is zeitronix).
And by adjust it by the percent you mean since I have 750cc and the stockers are 550 I should adjust it about 26.67% up? Or do I do it down since the injectors are bigger?
I think my biggest problems are the mods on the damned car. It never really idled well before and now I am throwing another interpreter on it which I think is just confusing it to hell. The intake manifold is one of the big things I think may be throwing the VE table way off also.
And sorry for the questions but also whats with the AFR thing? I have it hooked up to the analog out from the Zietronix into the O2 input on the MAFT Pro. I have the MAFT Pro set to 5 (Which is zeitronix).
And by adjust it by the percent you mean since I have 750cc and the stockers are 550 I should adjust it about 26.67% up? Or do I do it down since the injectors are bigger?
Also some quick tips to tune tip-in. Go to the Tune Response section. You will only use TPS Decay and TPS Enrichment. You can 0 out the other settings. Decay is what keeps the car from the RPM dropping to quickly. The higher the value the slower the RPM will drop down when you blip the throttle. TPS Enrich will just add some fuel after you let off the throttle. First play with the decay until you feel comfertable on quickly the RPM dips then use enrichment to remove the slow response.
Two reasons a MAFTpro will use a wideband is for logging and the AFR tracking feature. AFR tracking will try to keep the car at you desired AFR at WOT. I have never hooked up a Zietronix but maybe the output cable is connected incorrect. I think TTP or Bob can troubleshoot that with you.
Mainscale: adjusts the entire range by the same %
I have stock injectors so I have not played with the settings. I am going to assume it will have to negative value.
Dec 6, 2005, 02:26 PM
#11
I do have a scanner and could see the fuel trims but fixing the idle is only going to get it to idle 
The whole car just plain off doesnt run for crap. I am thinking perhaps the mainscale is needed to actually feed the ECU some usable numbers but I dunno. The other thing is my VE Tables are going to be WAY off considering my intake manifold and cams and whatnot. Ill disconnect it and throw in the stock MAF just to see if everything else is working fine. After that I guess I will try to use the MAFT Pro again. It just boggles me on how everyone elses car runs decent it just isnt perfect. Mine just doesnt run.
The whole car just plain off doesnt run for crap. I am thinking perhaps the mainscale is needed to actually feed the ECU some usable numbers but I dunno. The other thing is my VE Tables are going to be WAY off considering my intake manifold and cams and whatnot. Ill disconnect it and throw in the stock MAF just to see if everything else is working fine. After that I guess I will try to use the MAFT Pro again. It just boggles me on how everyone elses car runs decent it just isnt perfect. Mine just doesnt run.
Dec 6, 2005, 02:57 PM
#12
Originally Posted by TrinaBabe
I do have a scanner and could see the fuel trims but fixing the idle is only going to get it to idle The whole car just plain off doesnt run for crap. I am thinking perhaps the mainscale is needed to actually feed the ECU some usable numbers but I dunno. The other thing is my VE Tables are going to be WAY off considering my intake manifold and cams and whatnot. Ill disconnect it and throw in the stock MAF just to see if everything else is working fine. After that I guess I will try to use the MAFT Pro again. It just boggles me on how everyone elses car runs decent it just isnt perfect. Mine just doesnt run.
The whole car just plain off doesnt run for crap. I am thinking perhaps the mainscale is needed to actually feed the ECU some usable numbers but I dunno. The other thing is my VE Tables are going to be WAY off considering my intake manifold and cams and whatnot. Ill disconnect it and throw in the stock MAF just to see if everything else is working fine. After that I guess I will try to use the MAFT Pro again. It just boggles me on how everyone elses car runs decent it just isnt perfect. Mine just doesnt run.
Dec 6, 2005, 09:08 PM
#14
Not to throw a non-tuning wrench in the mix but the symptoms you describe sound like a vacuum leak. Are you sure you capped off any vacuum ports you are not using now with the removal of the emissions stuff?
Dec 6, 2005, 10:54 PM
#15
Well two things... the biggest is it shouldnt matter. The car runs speed density now, hence, unless it is leaking from the intake manifold it shouldnt matter. It measures the air at the intake manny and its not leaking I was running it with no MAF and no intake (Just the turbo). And I installed the intake manny well before which would have capped off the line going to the evap stuff anyways (via the EGR). I will have some time tomorrow night to screw with it so Ill give it a try and if it doesnt get easier quickly I will just switch back to the maf and see if the car runs.
The other problem is it is -5* F here
Cant help much and it makes it less than desirable to work on it.
I was running it with no MAF and no intake (Just the turbo). And I installed the intake manny well before which would have capped off the line going to the evap stuff anyways (via the EGR). I will have some time tomorrow night to screw with it so Ill give it a try and if it doesnt get easier quickly I will just switch back to the maf and see if the car runs. The other problem is it is -5* F here
Cant help much and it makes it less than desirable to work on it.