04-21-2019, 04:50 PM | #1 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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STP Fuel additive problem
Hello everyone..
I used STP Fuel additive for no reason ( i thought it’s something good for the injectors). I used STP 5-1 Fuel System Cleaner. Now I have leaking injectors: Lost the performance, fuel smell for very long time in cold start. 1- The car running too Rich. LTFT - 23% scanning. 2- fuel in the engine oil. 😵🤯 No codes Don’t ever never use STP fuel cleaner. New 2018 Camaro SS Auto 8000 km I don’t know what to do!! Now: I feel like the car start to come back to the life after 2000 km driving, and i changed engines oil, but the fuel getting in the oil pan again. I will change the engines oil again and see what will happen. Hope to STP effect expires Hope you get some warning ⚠️ Don’t do what I did. Good luck 🍀 |
04-21-2019, 05:27 PM | #2 |
Drives: '18 2SS/EU (+Recaros) M6 Red Hot Join Date: Nov 2018
Location: Sweden
Posts: 260
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That is crazy. Do you know which of the injectors are leaking?
Will you be troubleshooting/fixing it yourself or going to a dealer? |
04-21-2019, 06:59 PM | #3 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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It looks all injectors, but I’m going to a workshop 29/April to diagnose , hopefully leaking stops before.
I don’t now, I’m tired. I will update. Tomorrow i will change the engines oil again, the engine is suffering cause off the fuel leaking. |
04-22-2019, 04:12 PM | #4 |
Oh Oh it's Friday Night!
Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018
Location: Walton Woods
Posts: 1,061
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Well, sounds like more than the STP as the problem. Nevertheless, these engines do not require additives and in fact, they should be avoided. Good quality fuel and GM designated oil is all they need. I hope you get the problem corrected soon!
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2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
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04-23-2019, 12:00 PM | #5 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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Thank you my friends
Today I changed the oil the second time, engines oil smell a way better ( not to much fuel smell), I think the problem start to disappear. Scanning shows (LTFT -8 %) bank 1 and bank 2 also. Hopefully 100% disappears next 500 mil or 1000 mil. I hope to everybody get the warning. I will update next week Thank you again |
04-29-2019, 02:27 AM | #6 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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God morning.
Today is the day Bank 1 LTFT is 0% Bank 2 LTFT is 0% ——— Don’t ever never use STP 5-1 Fuel cleaner. If you will use it, on your own, and don’t add all the bottle, be wise. I hope you all get the warning. Good luck |
04-29-2019, 03:12 AM | #7 |
Drives: '18 2SS/EU (+Recaros) M6 Red Hot Join Date: Nov 2018
Location: Sweden
Posts: 260
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Hi f.d thank you for your feedback. Great to hear you got the car sorted again.
Btw, where are you located in Sweden? I am in Skåne. |
04-29-2019, 03:51 PM | #8 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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05-20-2019, 10:25 AM | #9 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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The problem is back
After changing engines oil the LTFT is -1%, but few days later it’s go to -14% and -16% It’s really Rich mixture. LTFT is -6 % while driving, and go to -15 % when i release the throttle. Oil smell fuel little. I think, I really have injectors leaking. any body have idea? Help! |
05-24-2019, 11:36 AM | #10 |
Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,670
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Minus 6 is within normal. -15% off throttle is also normal it’s hitting dfco
What are the stft? If u had leaking injectors you’d know it. |
05-26-2019, 07:56 AM | #11 |
Drives: 2016 Camaro SS Join Date: Jul 2016
Location: Cleveland, OH
Posts: 92
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I think you are driving yourself crazy over nothing. You are seeing a final correction to the base injector pulse width that is completely normal. As long as short term is at or near 0% the system is fine. Probably seeing a periodic correction due to the canister being loaded with fuel vapors etc.
Enjoy your car. |
05-28-2019, 02:40 AM | #12 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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Thank very very much for reply.
. Every time i change engines oil, the car be perfect and ( LTFT ) go around 0% . But after 2 days ( LTFT ) go to negative like -5% -10% And the oil smell fuel |
05-31-2019, 02:33 PM | #13 |
Drives: camaro Join Date: Feb 2014
Location: Every day some were
Posts: 116
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I bought the fuel injectors on line for my car today.
I’m just waiting for the dealer to give me reply if the replacement number fits my car. Please question do I have to update the ECU for the new injectors? Or just replace them? |
06-02-2019, 08:05 PM | #14 |
Drives: 2019 ZL-1 Join Date: Feb 2009
Location: Troy, MI & Naples, FL
Posts: 2,019
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The ONLY fuel injector cleaner you should use is Chevron Techron. Its what GM sells- rebadged.
STP is JUNK
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