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Although the previous adjustments helped, it did not completely solve the problem. It’s likely it was not a vacuum leak as first thought, as vacuum leaks appear to cause lean rather than rich running.
The car is still running slightly rich and the ECU appears to be compensating for an over-rich mixture (reading on VF1-E1) is at 0.16V throughout the rev range. It also blows black smoke at high RPMs, although this has reduced. The idle is now steady at around 900rpm but car seems to struggle to maintain it.
After resetting the ECU, the VF1-E1 readings stay at 2.25 volts for a short period, but after around 1 minute, go back to 0.16V, at higher RPMs it return to 2.25 volts, but after a 3 minute drive, the voltage stays at 0.16V.
The car is a 1992 Corolla FXGT.
What I have done to try and alleviate the problem:
A) Checked and adjusted timing, with TE1/E1 shorted, to ~12 degrees
B) Tested spark plug leads (replaced 1 faulty lead)
C) Checked injectors for excessive noise, also checked injector resistance. One injector was slightly noisy, but replaced all fuel injectors and seals
D) Cleaned the ISCV
E) Replaced sticking thermostat and all temperature sensors
F) Replaced airflow meter (does anyone have the resistance values for this part so I can test it?)
G) Tested distributor cap resistance values; these were out of specification when the car was at operating temperature, so replaced distributor, rotor, and distributor cap. Retested (both cold and at operating temperature) all within specification
H) Tested TPS. The TPS was faulty as resistance readings were out of specification between E2 and VTA at 0.8mm gap. New TPS was installed and adjusted so values were within specification. The car now accelerates better and idles slightly stronger. However, the VF1 and E1 reading is still at 0.16 volts.
I) O2 sensor was tested both using VF1-E1 and OX-E1. It is behaving correctly fluctuating at the right amount and voltages (from OX sensor) are within spec
J) Compression was tested all at 155-160PSI, not high, but still within specification. The car does use oil.
I have posted this at club4AG as well and received some guidance, but I’m beginning to run out of ideas. Any help would be appreciated
