88pioneerxj
NAXJA Forum User
This may be the thread to end all SMOG threads..
Hi everyone,
I have an '88 RENIX 4.0L XJ Pioneer (230,000 miles) with a donor engine from a 1991 High Output 4.0L XJ, and I didn’t realize what a massive headache it would be to pass smog here in SoCal (I'm from out of state).
So far, I’ve failed smog 3 times, with Gross Polluter results across all measurements—even after replacing the catalytic converter. Until I researched a bit;
The Issue:
- Assuming that new Cat, ignition system and fuel injection is replaced - car driven 40 miles pre-test, kept running while waiting and all the forum tricks mentioned followed, would replacement parts need to be for the 91' engine?
- What can a 20-something mechanic (me) do to get this car to pass the California smog test? Have any of you seen this type of setup before or know of a solution? I love this car and really want to make it work - keep it alive as long as possible.
TECH SPECS:
1 . 1988 Jeep Cherokee Pioneer
2. 4.0L
3. Automatic Transmission (4 speed)
4. Factory Transfer Case
5. Engine is from 1991 XJ High Output 4.0L
Hi everyone,
I have an '88 RENIX 4.0L XJ Pioneer (230,000 miles) with a donor engine from a 1991 High Output 4.0L XJ, and I didn’t realize what a massive headache it would be to pass smog here in SoCal (I'm from out of state).
So far, I’ve failed smog 3 times, with Gross Polluter results across all measurements—even after replacing the catalytic converter. Until I researched a bit;
The Issue:
- The ECM, electronics, wiring harness, and transmission are from the original 1988 RENIX system.
- The engine is a 1991 High Output model, which was designed for computer-controlled injection and timing (i believe)
- The 1988 RENIX ECM controls timing using the Crank Position Sensor, while the 1991 HO engine relies on its own computer controls for timing and injection.
- Assuming that new Cat, ignition system and fuel injection is replaced - car driven 40 miles pre-test, kept running while waiting and all the forum tricks mentioned followed, would replacement parts need to be for the 91' engine?
- What can a 20-something mechanic (me) do to get this car to pass the California smog test? Have any of you seen this type of setup before or know of a solution? I love this car and really want to make it work - keep it alive as long as possible.
TECH SPECS:
1 . 1988 Jeep Cherokee Pioneer
2. 4.0L
3. Automatic Transmission (4 speed)
4. Factory Transfer Case
5. Engine is from 1991 XJ High Output 4.0L