Hard time starting

Tiny
SARGON KHABEER
  • MEMBER
  • 2005 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 176,000 MILES
It has hard time starting when it is warm outside or when it has been driven for a while. I have replaced the maf and the intake manifold gasket and still no luck. I have p0171 code. When it first starts, it jumps to 2000 rpm then slowly go down. I tired to find a vacuum leak but cannot find one. At 700 rpm, the shrtft1 is at -20.3. Longft1 is at 30.5. O2b1s2 is at 0.115 and o2b1s1 is at 2.395. This is all from live data.

Freeze data at 900 rpm.
Shrtft1 0.00
Longtft1 40.0
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Wednesday, June 1st, 2016 AT 9:55 PM

32 Replies

Tiny
SARGON KHABEER
  • MEMBER
Here are the images from the scanner.
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Wednesday, June 1st, 2016 AT 9:59 PM
Tiny
SATURNTECH9
  • EXPERT
With the p0171 more then likely you have a vacuum leak somewhere. The best way to find a vacuum leak is by injecting smoke in the intake manifold. You could watch short term fuel trim to spike and spray carburetor spray around all vacuum sources. But smoke works the best by far.
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Wednesday, June 1st, 2016 AT 10:26 PM
Tiny
SARGON KHABEER
  • MEMBER
I did spray carburetor cleaner, but no luck.
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Wednesday, June 1st, 2016 AT 11:01 PM
Tiny
SATURNTECH9
  • EXPERT
Smoke is truly the best spraying around is a hit and miss. Smoke is truly the best way.
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Wednesday, June 1st, 2016 AT 11:03 PM
Tiny
SARGON KHABEER
  • MEMBER
Where would I hook up the smoke machine?
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Wednesday, June 1st, 2016 AT 11:32 PM
Tiny
SATURNTECH9
  • EXPERT
To the brake booster hose that goes to the intake manifold.
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Wednesday, June 1st, 2016 AT 11:36 PM
Tiny
SARGON KHABEER
  • MEMBER
Okay, I will keep you posted.
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Wednesday, June 1st, 2016 AT 11:41 PM
Tiny
SATURNTECH9
  • EXPERT
Sounds good.
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Thursday, June 2nd, 2016 AT 5:39 AM
Tiny
SARGON KHABEER
  • MEMBER
So, I did a smoke test today and I couldn't find any vacuum leaks. So I reconnected the hose to the break booster and scanned for codes, this time it gave me 2 codes. P0171 and p0113 which is intake air temperature sensor. So I cleaned the maf/iat sensor with carb cleaner, cleared the code and drove it for a bit and check engine light came back with p2196 o2 sensor signal biased/stuck rich. So I cleared it again and drove it till the light came back on again, and this time it gave me the p0171 again
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Friday, June 3rd, 2016 AT 11:13 PM
Tiny
SATURNTECH9
  • EXPERT
What did you use to clean the mass air flow sensor?What did you use to inject the smoke?
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Saturday, June 4th, 2016 AT 8:12 AM
Tiny
SARGON KHABEER
  • MEMBER
The maf is actually new but I still cleaned it with maf cleaner. As for smoke test, I used the cigar method. Maybe not good enough?
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Sunday, June 5th, 2016 AT 7:53 AM
Tiny
SATURNTECH9
  • EXPERT
I see I just read your answer again you used carb cleaner to clean the mass air flow sensor. Carb spray is oily you should only use maf sensor cleaner so get a can and do it that way. Also the cigar method doesn't really work effectively.I built a smoke machine from a old metal paint sprayer.I drilled a hole in the bottom center of the paint cup. Installed a glow plug from a 80's diesel K1 Chevy blazer. Then installed two nipples on top of the paint cup one on each side. One for the pump and the other to inject the smoke.I use a old nebulizer pump they use for kids asthma.I block off the throttle body before injecting the smoke.I use unscented mineral oil in it I got from a feed store.I attached pics of it not pretty but have used it many times to find vacuum leaks Evap leaks exhaust leaks etc it works amazingly well.
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Sunday, June 5th, 2016 AT 9:29 AM
Tiny
SARGON KHABEER
  • MEMBER
Ok, I'll try the paint can smoker
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Sunday, June 5th, 2016 AT 4:06 PM
Tiny
SATURNTECH9
  • EXPERT
Make sure you use a fuse and the paint cup gets very hot when using it be very careful. Only handle it by the handle of the sprayer.
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Sunday, June 5th, 2016 AT 4:17 PM
Tiny
SARGON KHABEER
  • MEMBER
Ok, so I did a smoke test using a pint can and little compressor hooked up to it on the side and on top another house going to the break booster. I found a leak near the pcv on the valve case. I used jb weld and tested it again, no leak at all but the code came back again and it's still having hard time starting sometimes. Btw, I replaced the upstream o2 sensor and still no improvement
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Wednesday, June 15th, 2016 AT 1:19 PM
Tiny
SARGON KHABEER
  • MEMBER
How would I test the fuel pressure? Where would I hook up the gauge to?
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Wednesday, June 15th, 2016 AT 5:50 PM
Tiny
SARGON KHABEER
  • MEMBER
I used maf cleaner and I found this video on YouTube showing how to make a smoke machine using a paint can and small compressor. Charcoal inside and cardboard which produced a lot of smoke. Compressor hooked up to the inlet on the paint can and another hose hooked up to the outlet going to the intake
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Wednesday, June 15th, 2016 AT 6:48 PM
Tiny
SATURNTECH9
  • EXPERT
Yeah charcoal would make a lot of smoke I like the unscented mineral oil it's smoke on demand. So when it runs down the road does it have good power?If it does then I wouldn't suspect low fuel pressure. You would have to check the fuel pressure at the banjo fitting at the fuel rail. There is no nipple on those to hook to. They rent a gauge at auto zone to check fuel pressure. Also have you checked the coolant temp sensor that feeds engine temp to the ecm?
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Wednesday, June 15th, 2016 AT 7:06 PM
Tiny
SARGON KHABEER
  • MEMBER
So what should the fuel pressure read as? Also where is the coolant temp sensor
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Wednesday, June 15th, 2016 AT 7:48 PM
Tiny
SATURNTECH9
  • EXPERT
E2 in the diagram is the coolant temp sensor the pressure should be 44-50 psi
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Wednesday, June 15th, 2016 AT 10:26 PM

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