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For those who want a catch up... http://www.pradopoint.com/showthread...Gutless-wonder
Long story short.
Car ran like crap for a long time with VERY high fuel usage.
1st, replaced the usual filters during a service... oil (obviously) air and fuel
2nd replaced plugs (correct ones) and leads
No change
3rd, after noticing detonation I stripped down the intake manifold completely, all the way down to the inlets. I scrubbed and cleaned and even polished the vast majority of it. (I was keen I know!)
4th, repaired the broken knock sensor harness (You should really check yours, it's a known problem)
Noticed some improvement.
5th, added water injection.
Noticed fuel economy improvement.
6th replaced timing belt, pulley, tensioner and water pump. Also hydraulic tensioner (never again!) radiator hoses and accessory belts. Upon replacing the timing belt I noticed that the belt was so far out of alignment it wasn't funny. With the cams at TDC, my crank was about 27 degrees advanced. This would mean that with the crank at TDC, my cams were 27 degrees retarded right?
MASSIVE improvement. Infact, I daresay problem solved. Or so I thought.
Since cleaning the intake and throttle body, I will now get a check engine light the moment I put the car under some reasonable load. If I putter about and never give it any beans, all runs smooth. The moment I ask for the extra power I've just restored, the CEL comes on, and my power goes away and I'm back to the Gutless Wonder. Next start up, CEL is gone until I ask for that power again.
The codes I get are 41 (Throttle Position Sensor signal) and 52 (Knock sensor signal, not sure which bank)
I've cleared the codes and disconnected the knock sensors. Problem still occurs. Am about to go check and clear the codes again, then test drive. Report back shortly.
Yes, I did remove the TPS from the throttle body, checked for free movement and then reinstalled. I think I will pull it off again also and verify. I was extremely tired (for those of you that recall the thread... I was up ALL night working on it) but I'm very confident I didn't use any cleaning agents on it. Only a wipe off with a rag before reinstallation.
I would really appreciate it if someone could grab a multimeter and measure the voltage with ignition ON engine OFF between pins 1&2, 1&3 and the resistance between 1&2 and 1&3 and then repeat the process with the engine running at normal idle (let it start and settle down to it's normal revs) and let me know what those revs were.
Even better yet, if someone happens to have the testing specs from Toyota of that TPS....
Long story short.
Car ran like crap for a long time with VERY high fuel usage.
1st, replaced the usual filters during a service... oil (obviously) air and fuel
2nd replaced plugs (correct ones) and leads
No change
3rd, after noticing detonation I stripped down the intake manifold completely, all the way down to the inlets. I scrubbed and cleaned and even polished the vast majority of it. (I was keen I know!)
4th, repaired the broken knock sensor harness (You should really check yours, it's a known problem)
Noticed some improvement.
5th, added water injection.
Noticed fuel economy improvement.
6th replaced timing belt, pulley, tensioner and water pump. Also hydraulic tensioner (never again!) radiator hoses and accessory belts. Upon replacing the timing belt I noticed that the belt was so far out of alignment it wasn't funny. With the cams at TDC, my crank was about 27 degrees advanced. This would mean that with the crank at TDC, my cams were 27 degrees retarded right?
MASSIVE improvement. Infact, I daresay problem solved. Or so I thought.
Since cleaning the intake and throttle body, I will now get a check engine light the moment I put the car under some reasonable load. If I putter about and never give it any beans, all runs smooth. The moment I ask for the extra power I've just restored, the CEL comes on, and my power goes away and I'm back to the Gutless Wonder. Next start up, CEL is gone until I ask for that power again.
The codes I get are 41 (Throttle Position Sensor signal) and 52 (Knock sensor signal, not sure which bank)
I've cleared the codes and disconnected the knock sensors. Problem still occurs. Am about to go check and clear the codes again, then test drive. Report back shortly.
Yes, I did remove the TPS from the throttle body, checked for free movement and then reinstalled. I think I will pull it off again also and verify. I was extremely tired (for those of you that recall the thread... I was up ALL night working on it) but I'm very confident I didn't use any cleaning agents on it. Only a wipe off with a rag before reinstallation.
I would really appreciate it if someone could grab a multimeter and measure the voltage with ignition ON engine OFF between pins 1&2, 1&3 and the resistance between 1&2 and 1&3 and then repeat the process with the engine running at normal idle (let it start and settle down to it's normal revs) and let me know what those revs were.
Even better yet, if someone happens to have the testing specs from Toyota of that TPS....
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