Needed to increase VE table by 30 everywhere
When I started my '90 Miata last night I noticed that I was idling very lean, like 19 AFR, so I increased my VE table by about 10 pts before I got the AFRs to the appropriate level. As I slowly started to drive off I noticed that EVERYWHERE was really lean so, again, I increased the entire VE table until I saw the appropriate AFRs. This increase was about 30pts everywhere else just so I could drive the car without it detonating on me. I should also mention that a similar event happened about a week ago where I needed to increase the fuel table. As it is I am scared to drive the car when I don't know what's wrong with it. My first thought is maybe the fuel pump is going bad so I'm not getting the proper fuel pressure which is why I would need a linear increase for the entire VE table.
Has anyone else has this problem? Does this sound like the tell-tail sign of of a catastrophe waiting to happen? What are some tests that I can do to narrow down the problem? Details about my setup: 1990 JRSC 1.6, DIY MS2, stock injectors, still have the old thing that is attached to the return fuel line to increase fuel pressure (part of the old piggyback system the previous owner had). |
Check the fuel pressure.
also, strongly recommended to get bigger injectors and drop the rrfpr. did you ever need to reduce the VE after the first time this happened? |
Is this a new MS install or has it been running for a while?
|
Happened to me with clogged fuel filter.
Otherwise it could be misfiring, and reading lean. |
Originally Posted by Ted75zcar
(Post 1386620)
Check the fuel pressure.
also, strongly recommended to get bigger injectors and drop the rrfpr. did you ever need to reduce the VE after the first time this happened? I know, I really want to get some good fuel injectors and ditch that rrfpr. Is there a recommended injector for only 7psi of boost? I was thinking these ones from Deatschwerks. No, its just slowly gotten worse from when it started happening a week ago. At first it was only 3 or 4 points higher to get the correct AFR. Within the last day and a half its only gotten worse.
Originally Posted by curly
(Post 1386621)
Is this a new MS install or has it been running for a while?
|
check your MAT corrections.
|
You can check a log for fuel Pressure yeah In tuner studio?
|
Originally Posted by adryargument
(Post 1386648)
You can check a log for fuel Pressure yeah In tuner studio?
post the msq. and post a log. honestly the FMU + MS2 isn't a big deal. the increase in fuel pressure is predictable -- I HIGHLY doubt its the issue. |
2 Attachment(s)
Attached are my MSQ and a log file. I don't have a good VE table right now because nothing is consistent. My car was driving fine for the past month so I don't think that the answer would be in the MAT settings but please do take a look.
Also, the log file here is with a fuel pressure gauge attached in between the hoses where my FMU sat before. For some reason I could not get a reading on the gauge at all tonight, always stayed at 0 even while the engines was running. Maybe the gauge has to be on the feed line instead of the return line? Maybe a faulty gauge. Not sure but Ill try swapping it. I'd really like for this pressure gauge to work so I could decide to buy the EV14 Deatschwerks if the injectors are the problem. |
FP needs to be measured on the fuel rail side of the regulator(s). This can be done between the hardline and the fuel rail.
|
Originally Posted by Ted75zcar
(Post 1386668)
FP needs to be measured on the fuel rail side of the regulator(s). This can be done between the hardline and the fuel rail.
|
No, the location with 30psi is correct. 30psi also sounds line ballpark for idle. What do you get when you remove the vac line to the regulator?
|
Originally Posted by Ted75zcar
(Post 1386672)
No, the location with 30psi is correct. 30psi also sounds line ballpark for idle. What do you get when you remove the vac line to the regulator?
So sounds like the fuel pump and regulator are fine. Does that leave the fuel injectors as the culprit? |
are you MAT and CLT sensors reading correctly? I can't open the log, away from TS.
speed density or AFM? |
Originally Posted by Ted75zcar
(Post 1386676)
are you MAT and CLT sensors reading correctly? I can't open the log, away from TS.
speed density or AFM? |
Wow I feel dumb. I just checked my warmup enrichment curve and, sure enough, the answer was there. Somewhere within my noob tuning I accidentally got half of my curve below 100%.
Thanks for all the help guys. |
Originally Posted by lyonnate23
(Post 1386765)
Wow I feel dumb. I just checked my warmup enrichment curve and, sure enough, the answer was there. Somewhere within my noob tuning I accidentally got half of my curve below 100%.
Thanks for all the help guys. |
Originally Posted by lyonnate23
(Post 1386765)
Wow I feel dumb. I just checked my warmup enrichment curve and, sure enough, the answer was there. Somewhere within my noob tuning I accidentally got half of my curve below 100%.
Thanks for all the help guys. I win. |
All times are GMT -4. The time now is 06:56 PM. |
© 2024 MH Sub I, LLC dba Internet Brands