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O2-sensor and Fuel Pumps
As some of you know, we have installed a 1995 C36 Engine, tranny, diff
(2.87) and engine computer (ABS and EA is a 1995 E320 wagon), into a 1988 300TE wagon. I was experiencing intermittant CHECK ENGINE lights and the codes were pointing to a LEAN CONDITION. Since we had retained the original two fuel pumps from the CIS M103, I decided to change the fuel-filter, thinking it may have an obstruction. After changing the fuel-filter I have gone approx. 3-months without any CHECK ENGINE lights. Just two weeks ago, I decided to change to a 3.07 limited-slip rear differential. And the next day, I got a CHECK ENGINE light while going through stop-n-go traffic in 2nd gear. An OBDII scan showed two codes: P1132- Manufacture controlled Fuel & Air Metering; and P0134 02 Sensor Circuit No Activity Detected, Bank 1, Sensor 1. We checked the O2 sensor, with a VOM and it tested good. Cleared CODE. 3-days later on a 5-hour drive to San Francisco at a steady 80MPH, the CHECK ENGINE light comes on. Same codes. CLEARED it. My mechanic hooked-up a fuel-pressure gauge and I drove for about 30-minutes, up long grades at full-throttle, just to see if the two CIS fuel-pumps were either giving too much pressure or not enough. Pressure was 48PSI at idle at upto to 58 PSI at full throttle with a long load. CHECK ENGINE did not come on. However, on a short drive 15-minute drive, the CHECK ENGINE came on. Same CODES. What to do? Do I just change out the front O2-sensor? It's a 4-wire one, will any BOSCH 4-wire work, or do I have to use the Mercedes specific front O2-sensor at almost 3-times the price? Should I change out the twin CIS fuel-pumps, and go to the single high volume, low-pressue fuel-pump of the stock C36? Should I clean out the MAS sensor? Any other ideas? Thanks in advance, :-) neil 1988 360TE AMG |
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