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Injectors on the way out? is it safe to get tuned still?
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01-02-2013, 03:53 PM | #1 |
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Injectors on the way out? is it safe to get tuned still?
So I started to feel a slight hesitation when I would floor it in 3rd gear around 4thousand rpms. I figured it had to be spark plugs because they have around 20k on them. At first I canceled out the idea of it being injector related, because all 6 were replaced last year around this same time. I also had the cylinders walnut blasted at the same time. So to me the only reason for this hesitation had to be the spark plugs.
So I today I replaced the spark plugs and the car felt better. Than slowly as the day went on I noticed it slightly happening again. So I logged the car on the way home, everything looks perfect the timing, AFR, boost all looked spot on. Then I took a look at my STFT and they were going all the way up to 30-34% by midrange and then brought down to negatives by the meth. On my old logs from about 2-3 months ago my STFT's wouldnt go above 12-15% then would come down by because of the meth. So I believe its injector related, and I'm scheduled for a tune tomorrow. So the question is, is it still safe to get tuned? I would post the logs but I use Virtual Dyno to veiw them and they are impossible to read with a screen shot. If someone would like to take a look at the logs I will send you the file if you PM me your email. thank you and sorry for the long rant.
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01-02-2013, 04:05 PM | #2 |
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It's possible. But in defense, it is much colder then it was 3 months ago, so it would require more fuel as the air is more dense, theoretically.
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01-02-2013, 04:25 PM | #3 |
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01-02-2013, 04:29 PM | #4 |
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I was actually just thinking that too, the last log I did was in early October weather was no where near what it was like today. For example my Inlet temps in October were 60 at its lowest, today's my inlet temps were reaching 37 degrees. The car feels strong it only feels hesitant once an a while only from a 3rd gear roll maybe its in my head because I drive my car less in the winter.
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01-02-2013, 04:43 PM | #5 |
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Assuming it wasn't your TCS kicking in maybe time for blasting...how many miles?
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01-02-2013, 05:00 PM | #6 |
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Had it blasted last January I don't think it'd be due this soon. Like I said I also changed the spark plugs today too and the Injectors were done last January as well. Also when I log or get on it I always turn TCS completely off. So I don't know, and it only happens from a 3rd gear roll. I guess either way I'm going to go in for my tune appointment and hope nothing bad happens
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01-03-2013, 06:29 AM | #7 |
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Where are you getting tuned?
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01-03-2013, 08:25 AM | #8 |
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Try pouring in some strong fuel injection cleaner or 100 octane (best option) -- It's possible the injectors might be dirty/clogged up
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01-03-2013, 08:49 AM | #9 |
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I just replaced an injector yesterday that was only 3 months old. It was 100% bad and caused my car to have slightly hiccups mid pull, usually misfire up top, and cause my STFT of that bank to act funny in comparison to the other and cause AFR to act funny as well.
These injectors can go bad very quickly....take it from someone who has had over 20 injectors in his car.
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01-03-2013, 11:19 AM | #10 | |
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01-03-2013, 11:25 AM | #11 |
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ill give that a shot , do you recommend any good ones?
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01-03-2013, 11:57 AM | #12 | |
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OP, post a log... if you can catch the hesitation, it should show in the log. Can you hear a change in exhaust note when it happens? |
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01-03-2013, 01:04 PM | #13 | |
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01-03-2013, 01:42 PM | #14 | |
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01-03-2013, 02:00 PM | #16 | |
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Anyway log boost channels, at least timing setpoint/correction cyl 1, LT/ST trims. And maybe you pump pressures. I bet its torque reduction by the DME |
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01-03-2013, 03:09 PM | #17 | |
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Honestly, it sounds like you do have an injector going bad. I've replaced so many injectors on my car and this is how they all started. Slight hesitation that would turn into a misfire. Hard to reproduce on stock boost, easy when tuned. The best way to test it is to lug the car (go in 3rd at around 2000 rpm and floor it). The last one I dealt with was a little different now that I have a single turbo, but my point was that injectors can go bad very quickly. I am extremely well versed in dealing with misfires on stock turbos, which was usually bad injectors. Happens when you have replaced 20 of them.
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01-03-2013, 03:14 PM | #18 |
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Chevron Techron is the mainstream option, I'd personally recommend Lucas Oil (they sell a specific "Fuel Treatment" for Turbo/Performance Engines). Like I said, a gallon or two of 100 octane from a Sunoco station would be the best (try to get it in when you're real low on gas & run only the 100 octane).
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01-03-2013, 07:15 PM | #19 | |
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01-03-2013, 07:22 PM | #20 | |
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01-04-2013, 04:40 PM | #21 |
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so here some logs. Sorry if there hard to read its a pain to read sceen pics of VD logs, but I but the main index line on when the highest points of the STFT's were read and you can also see some of the other stuff I logged.
The first log is from October. (weather was in the 50's) The second log is from two days ago when I made this thread. (weather was in the 20's) The Third log was today after I was flashed on to the new v402 maps and had some psi added by my tuner.(weather was mid 30's) The hesitation is still slightly there but it seems to be temperamental as in sometimes I don't feel it and sometimes worse then others. Also only during the first few hundred- thousand rpms when I floor it, regardless of what gear I'm in.
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