Changed timing belt, now a few wierd issues

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excessive

excessive

10 Year 15 Year
Joined
Jan 11, 2011
Threads
149
Messages
3,629
Location
Charleston, sc
Hello 100 series forum, i spend most of my time on the 80 serires forum, but i was hoping to get some help here. Today i finished replacing the timing belt on my wife's 2003 truck , which has the 2UZ-Fe motor in it. I had the service manual, and the guide from ih8mud.

The job was long and annoying, but not overly difficult. I opted to replace the water pump, timing belt tensioners, spark plugs, and thermostat while i was in there.

So after everything was back together, I started the truck, and it started up just fine and sounded ok. It seems to run fine and has normal power. After a few mile test drive, it has developed a slight "ticking" that i don't remember before. I spun the crankshaft around to 0 degrees TDC, and popped enough screws to peek insde the two top timing covers up top to verify that the timing was still good. The timing appears to still be fine according to the marks on the two cam gears.

also, i have four OBD codes come up P0171 and P0174 two times each. They are "system too lean bank 1" and "system too lean bank2"

how badly did i screw up and what should i do to fix it? :crybaby:
 
Or perhaps intake manifold leak?

Steve
 
thanks for the suggestions. I decided to switch back to the original spark plugs, to see what happens. It seems a bit quieter and the codes have not returned after a few miles of driving. I still detect a slight ticking/unusual noise around the water pump area. I am hoping that it is just the water pump settling in.
 
excessive said:
thanks for the suggestions. I decided to switch back to the original spark plugs, to see what happens. It seems a bit quieter and the codes have not returned after a few miles of driving. I still detect a slight ticking/unusual noise around the water pump area. I am hoping that it is just the water pump settling in.
Click to expand...

It could have been a bad plug... Happened in my X5, it's annoying to try to track it down if it's an intermittent misfire.
 
well, i put the old plugs back in, and initially it did seem better, but now the codes are back again.....

I think i am gonna have to take it to the mechanic, not sure what i screwed up, but i don't want to make it any worse :(
 
what are the codes?
 
jasonbraswell said:
what are the codes?
Click to expand...
he listed them above..

P0171 and p0174 system banks lean


see if this helps

DTC P0171 System too Lean (Bank 1)

CIRCUIT DESCRIPTION
DTC Detection Condition



103174676





Fuel trim refers to the feedback compensation value compared to the basic injection time. Fuel trim includes short-term fuel trim and long-term fuel trim.

Short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at its ideal theoretical value. The signal from the heated oxygen sensor indicates whether the air-fuel ratio is RICH or LEAN compared to the ideal theoretical value, triggering a reduction in fuel volume if the air-fuel ratio is rich, and an increase in fuel volume if it is lean.

Long-term fuel trim is overall fuel compensation carried out long-term to compensate for continual deviation of the short-term fuel trim from the central value due to individual engine differences, wear over time and changes in the usage environment.

If both the short-term fuel trim and long-term fuel trim are LEAN or RICH beyond a certain value, it is detected as a malfunction and the MIL lights up.

HINT:
• When DTC P0171 or P0174 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 or P0175 is recorded, the actual air-fuel ratio is on the RICH side.
• If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 or P0174 is recorded. The MIL then comes on.
• If the total of the short-term fuel trim value and long-term fuel trim value is within ±25% , the system is functioning normally.
Wiring Diagram


http://alldatapro.com/alldata/PRO~V...40560/172059763/172060109/103174675/103174152



Step 1 - 3



103174677




Step 4 - 7



103174678




Step 8 - 10


http://alldatapro.com/alldata/PRO~V...40560/172059763/172060109/103174675/103174679



Step 11 - 12


103174680




INSPECTION PROCEDURE

HINT: Read freeze frame data using hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, this is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

CONFIRMATION DRIVING PATTERN


103174216




a. Connect the hand-held tester to the DLC3.
b. Switch the hand-held tester from the normal mode to the check mode.
c. Start the engine and let the engine idle for 120 seconds or more.
d. Drive the vehicle at 40 km/h (25 mph) or more for 20 seconds or more.
e. Let the engine idle for 20 seconds or more.
f. Let the engine idle for 30 seconds .
HINT: If a malfunction exists, the MIL will light up during step (f).
NOTE: If the conditions in this test are not strictly followed, detection of the malfunction will not be possible. If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (c) to (f),then perform steps (c) to (f) again.
CHECK FOR INTERMITTENT PROBLEMS

hand-held tester only:
By putting the vehicle's ECM in the check mode, 1 trip detection logic is possible instead of 2 trip detection logic and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.
1. Clear the DTC.
2. Set the check mode.
3. Perform a simulation test.
4. Check the connector and terminal.
5. Handle the connector.
 
Thanks for the suggestions everyone... I am taking it to the mechanic tomorrow. I cannot visually see anything wrong anywhere. i will update the post when i find out what caused the problem in case anyone else has this problem,.
 
UPDATE:

Ok, so I took the truck to a trusted landcruiser mechanic, he quickly found the source of the problems.

1. The codes were caused by a small vacuum line that I forgot to attach. I thought this might be the case, and I looked over and over again for a vacuum line, but somehow I must have missed it. So those of you who were guessing intake manifold leak were on the right track.

2. the tapping noise was the crankshaft pulley rubbing on one of the plastic timing belt covers, which my mechanic was quickly able to fix.

So thanks again for all the suggestions. PS> Alldata looks awesome, i need to sign up for that site!
 
hankinid said:
Or perhaps intake manifold leak?
Click to expand...

DWNUNDR said:
My guess would be a cracked vacuum line somewhere on the intake or similar, causing a lean condition.
Click to expand...

excessive said:
UPDATE:

Ok, so I took the truck to a trusted landcruiser mechanic, he quickly found the source of the problems.

1. The codes were caused by a small vacuum line that I forgot to attach. I thought this might be the case, and I looked over and over again for a vacuum line, but somehow I must have missed it. So those of you who were guessing intake manifold leak were on the right track.

2. The tapping noise was the crankshaft pulley rubbing on one of the plastic timing belt covers, which my mechanic was quickly able to fix.
Click to expand...

Wow, hankinid and DWNUNDR, you guys are good! ILOVEMUD.
 
excessive said:
PS> Alldata looks awesome, i need to sign up for that site!
Click to expand...

Glad to hear you got it resolved.

Personally I have FSM and subscribe to alldata (alldatadiy). I like the idea of alldata but it does not compare to the fsm at all. It's more like spotty excerpts of the fsm in my experience. FSM is the best source and techinfo is great too (just pricing model can be steep). The best value I've gotten from alldata is acces to full tsb info - loosely you could compare 5 years of alldata for the price of 2 day subscription to techinfo (iirc it's <25 for 5yr alldatadiy with promo vs 15 for 2day techinfo).
 
Last edited:
^ +1
The material in the post above is from AllData Pro which runs around $175/mth. Designed for shops to provide access to all makes FSM data etc.

AllDataDIY is good, but not nearly enough info to do anything useful. The FSM is what you want.
 
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