PhilipA
20th September 2012, 09:07 PM
I bit the bullet today and removed the Thor plenum on my RRC 92 to look for the leak near the back of the motor on the LH rear. The leak only occurred on heat soak after quite a bit of idling and ran down the LH side of the bellhousing.
Anyway it was a bit inconclusive , but I think it was coming from one of the heater hoses at the firewall. There appeared to be a slightly darker area around the bottom stub on the firewall. I tightened the clamps.
I spent about an hour with mirror on stalk, borescope, and a stepladder with me lying full length on the engine. It was still not really evident but the head/block interface looked OK and the inlet manifold was tight.
I can only hope as my back does not like it.
Just so that forumites can have a laugh I will fess up
After I replaced the cam after getting home froom Cape York last September, I was vaguely disappointed with the engine performance and an irregular idle.
I put it down to the Bosch gen111 recod injectors I fitted at the same time replacing a set of Gen11s not being in very good condition.
However when I was in Mooloolabah last month , I heard an exhaust leak so tightened up the manifolds, and then found a hole just near the 2-1 join in the RH exhaust. While I was idly feeling around the LH bank after tightening the exhaust manifold I found 1 plug lead not on the plug and maybe 5MM away and another also loose.
This revolutionised the idle and increased performance , probably by 14% LOL. My fuel economy went from 16.5L per 100 Km pulling my camper to about 15 returning to Sydney. It is clear tha the plug was firing with not much load but dropping out on idle when not fully warm.Agggggh.
So today I am removing all the stuff, and when I removed the TPS plug, I find that the red=signal wire was broken off where I had overcrimped it.It has obviously been like this since I reassembled the engine last year
The weird thing is that the car drove well, and the only thing I really noticed was that the injector override cutoff over 1500RPM was not noticable. I put this down to the aftermarket IAC I had fitted and the fast idle and the new cam making the transition not noticable.. I could really notice it once I took the car for a test drive. So it was not working as the control parameters are VSS signal plus RPM>1500 plus TPS< 0.49V.
While I have O2 sensors,it is obvious that the TPS on a 14CUX has not much role in steady state driving , and that the MAF and O2 sensors control fuelling. However the tip in acceleration is much better and the car feels as much like a sports car as a 3.9RRC can.
I am darned if I know what the Unichip used to control the "Vacuum" advance as I believe the TPS is the primary source of this info.
Any way I will be making petrol now! Still not enough to drive the RRC down to the EXPO on sunday . I will still bring the Honda Jazz as it is$15 in fuel vs $40.
Regards Philip A
Anyway it was a bit inconclusive , but I think it was coming from one of the heater hoses at the firewall. There appeared to be a slightly darker area around the bottom stub on the firewall. I tightened the clamps.
I spent about an hour with mirror on stalk, borescope, and a stepladder with me lying full length on the engine. It was still not really evident but the head/block interface looked OK and the inlet manifold was tight.
I can only hope as my back does not like it.
Just so that forumites can have a laugh I will fess up
After I replaced the cam after getting home froom Cape York last September, I was vaguely disappointed with the engine performance and an irregular idle.
I put it down to the Bosch gen111 recod injectors I fitted at the same time replacing a set of Gen11s not being in very good condition.
However when I was in Mooloolabah last month , I heard an exhaust leak so tightened up the manifolds, and then found a hole just near the 2-1 join in the RH exhaust. While I was idly feeling around the LH bank after tightening the exhaust manifold I found 1 plug lead not on the plug and maybe 5MM away and another also loose.
This revolutionised the idle and increased performance , probably by 14% LOL. My fuel economy went from 16.5L per 100 Km pulling my camper to about 15 returning to Sydney. It is clear tha the plug was firing with not much load but dropping out on idle when not fully warm.Agggggh.
So today I am removing all the stuff, and when I removed the TPS plug, I find that the red=signal wire was broken off where I had overcrimped it.It has obviously been like this since I reassembled the engine last year
The weird thing is that the car drove well, and the only thing I really noticed was that the injector override cutoff over 1500RPM was not noticable. I put this down to the aftermarket IAC I had fitted and the fast idle and the new cam making the transition not noticable.. I could really notice it once I took the car for a test drive. So it was not working as the control parameters are VSS signal plus RPM>1500 plus TPS< 0.49V.
While I have O2 sensors,it is obvious that the TPS on a 14CUX has not much role in steady state driving , and that the MAF and O2 sensors control fuelling. However the tip in acceleration is much better and the car feels as much like a sports car as a 3.9RRC can.
I am darned if I know what the Unichip used to control the "Vacuum" advance as I believe the TPS is the primary source of this info.
Any way I will be making petrol now! Still not enough to drive the RRC down to the EXPO on sunday . I will still bring the Honda Jazz as it is$15 in fuel vs $40.
Regards Philip A