MAP sensor issue?
05-09-2017, 09:46 AM
#1
MAP sensor issue?
I have an LS Turbo setup, tuned on EcTune. MAP sensor is an AEM 3.5 Bar. It is wired correctly. For some reason when I go to start the car now, at KOEO the sensor reads 5.40-5.90 in Hg (1.67 Volts) via Datalogger, as if I had a massive vacuum leak. I have looked for any sort of vacuum leak and cannot find any.
When I go to start the car, it cranks over a few times and then acts like its barely catching but won't start, I blip the throttle a few times and it will catch JUST enough to start and I can give it gas, it starts and idles and the MAP sensor just starts reading correctly 15.80-16.30 in Hg @ ~1V (idling). I thought it was the MAP sensor itself (had another 3.5 Bar AEM) so I got a new one, and it didn't change anything.
Has anyone had this issue as well?
Is it EcTune itself?
Would it be the Ostrich or the ECU for any reason?
If I had voltage draw off the battery somewhere, could that do it? If so, I don't understand why I would see the correct voltage at KOEO.
On a separate note, after driving for about 10 minutes, my water temp gets hot (212F +) and my sensor seems to just die. On http://rover.ebay.com/rover/13/0/19/DealFrame/DealFrame.cmp?bm=367&BEFID=96477&acode=378&code=378&aon=&crawler_id=507376&dealId=PnUZmSfpzDPrHg7BS6tbwA%3D%3D&searchID=&url=https%3A%2F%2Fautoplicity.com%2F10293619-aem-electronics-30-4110ns-digital-wideband-uego-gauge-without-sensor%3Futm_source%3DShoppingCom%26utm_medium%3DCSE%26utm_campaign%3DShoppingComNOFITMENT&DealName=AEM%20Electronics%2030-4110NS%20Digital%20Wideband%20Uego%20Gauge%20Without%20Sensor&MerchantID=507376&HasLink=yes&category=0&AR=-1&NG=1&GR=1&ND=1&PN=1&RR=-1&ST=&MN=msnFeed&FPT=SDCF&NDS=1&NMS=1&NDP=1&MRS=&PD=0&brnId=2455&lnkId=8070676&Issdt=170508051346&IsFtr=0&IsSmart=0&dlprc=129.95&SKU=10293619, it reads "- - -" and on Datalogger reads 16.40 AFR (max that it will read). If I pull over and let the car cool down for a few minutes, the O2 comes back. Not a gradual comeback, but immediately back to 12.5-13.0 like nothing was wrong. The wiring is fine.
Does anyone know why this happens or how to fix it?
P.S. yes I know I have a cooling issue (working on it)
When I go to start the car, it cranks over a few times and then acts like its barely catching but won't start, I blip the throttle a few times and it will catch JUST enough to start and I can give it gas, it starts and idles and the MAP sensor just starts reading correctly 15.80-16.30 in Hg @ ~1V (idling). I thought it was the MAP sensor itself (had another 3.5 Bar AEM) so I got a new one, and it didn't change anything.
Has anyone had this issue as well?
Is it EcTune itself?
Would it be the Ostrich or the ECU for any reason?
If I had voltage draw off the battery somewhere, could that do it? If so, I don't understand why I would see the correct voltage at KOEO.
On a separate note, after driving for about 10 minutes, my water temp gets hot (212F +) and my sensor seems to just die. On http://rover.ebay.com/rover/13/0/19/DealFrame/DealFrame.cmp?bm=367&BEFID=96477&acode=378&code=378&aon=&crawler_id=507376&dealId=PnUZmSfpzDPrHg7BS6tbwA%3D%3D&searchID=&url=https%3A%2F%2Fautoplicity.com%2F10293619-aem-electronics-30-4110ns-digital-wideband-uego-gauge-without-sensor%3Futm_source%3DShoppingCom%26utm_medium%3DCSE%26utm_campaign%3DShoppingComNOFITMENT&DealName=AEM%20Electronics%2030-4110NS%20Digital%20Wideband%20Uego%20Gauge%20Without%20Sensor&MerchantID=507376&HasLink=yes&category=0&AR=-1&NG=1&GR=1&ND=1&PN=1&RR=-1&ST=&MN=msnFeed&FPT=SDCF&NDS=1&NMS=1&NDP=1&MRS=&PD=0&brnId=2455&lnkId=8070676&Issdt=170508051346&IsFtr=0&IsSmart=0&dlprc=129.95&SKU=10293619, it reads "- - -" and on Datalogger reads 16.40 AFR (max that it will read). If I pull over and let the car cool down for a few minutes, the O2 comes back. Not a gradual comeback, but immediately back to 12.5-13.0 like nothing was wrong. The wiring is fine.
Does anyone know why this happens or how to fix it?
P.S. yes I know I have a cooling issue (working on it)
05-11-2017, 05:30 AM
#2
Re: MAP sensor issue?
What pin is our wideband wired to? What was changed about your tune recently (either tune, or parts), or is this your very first tune on this program with this setup? Methinks you might need to adjust some offsets..
05-11-2017, 11:14 PM
#3
Honda-Tech Member
Join Date: Feb 2017
Location: Democratic People's Republic of Khalifornia
Posts: 66
Likes: 0
Received 0 Likes
on
0 Posts
Re: MAP sensor issue?
I agree with Txdragon. Turn the car to on, but don't crank. Check what the MAP readout is supposed to be. It should be at 0 psi or close to that. Have a buddy go suck start then blow into the MAP sensor. Ensure that the voltages do change (from the ECU readout). If the sucking and blowing creates changes in the readout, then you have an offset issue.
As for the wideband, how far away from the turbo is it mounted? Methinks you're overheating it. You need at least 36 inches away from the turbo. Also, did you mount it before or after the turbo?
As for the wideband, how far away from the turbo is it mounted? Methinks you're overheating it. You need at least 36 inches away from the turbo. Also, did you mount it before or after the turbo?
Thread
Thread Starter
Forum
Replies
Last Post