QuestionQUESTION: It wont drop to low idle even after its warmed up (90% of the time anyway). I've replaced cap/rotor, plugs wires and given a full tune up. I tried adjusting the idle screw and fiddled with the timing(worked for a minute). It has another issue of lurching sometimes like it wants to stall but then picks up again. I haven't replaced the o2 sensor?
ANSWER: you need to look at the values of the tp sensor and also look at the iac. valve let me know what they are
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QUESTION: Thanks, The tp sensor is reading 2.7vdc min 3.8max when adjusted? shouldn't it be around .9,I need a new one? I cleaned the iac seems ok but when I warmed up for the first time after cleaning it clicked allot until warm. I also cleaned the TB and checked timing, all good. Haven't got to the egr or O2 yet, looks like I have some creative vacuum routing :( and nothing was hooked to the vacuum spout on the bottom of the TB assembly, where's it supposed to go,(86 2.3l 4X4 diagram)? The engine is still racing at this point, very fast sometimes. One last thing how is the oil pressure gauge supposed to be hooked up, the sensor has a solid threaded oultlet end and nothing is connected to it, my subaru uses vacuum? is this electrical? Thanks again. Dan.
Answer1. Perform Key On, Engine Running (KOER) self-test and address any service codes that are received as necessary.
2. If the KOER test results in a pass code, check timing belt alignment. Remove the rubber plug forward of the camshaft gear and check to verify that the camshaft gears timing mark lines up with the indicator mark when the crankshaft is set to TDC for #1 cylinder on compression stroke.
3. Check fuel pressure. Fuel pressure should indicate 30-33 PSI and increase on acceleration. When vacuum to the fuel pressure regulator decreases during acceleration, the fuel pressure should increase. If fuel pressure drops or is low, check for a restricted filter and replace the fuel pump(s) as necessary.
4. Check the quality of spark out of any spark plug wire at the spark plug as the engine is cranking or running to verify that spark will jump nearly a 1/2" gap and has strong bluish color.
5. If spark is erratic or weak, check the output on the coil wire to determine if there is an issue with the secondary (wires, cap, rotor, etc.), or a coil, coil connection, power supply to the coil type issue.
6. If spark output, timing belt alignment and fuel pressure all appear to be OK, nurse the engine added fuel during an acceleration event and check for the engine to run better suggesting a lean condition. Check injector flow, etc. and clean as necessary.had one two weeks ago timing belt was stretch replace it and ran fine.
