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After oil pump change, she won’t run right. Please 200 1993

posted by  eyyu on  Mon Dec 21 12:06 CST 2009
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last visit: Tue Apr 8 14:16 CST 2014
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I started this project 6 month ago to replace the oil pump (the real problem was the classic oil delivery tubing seal). While I was doing that, I got side-tracked by other more urgent matters on my list. Now, Christmas is almost here and I promised myself to get here off the jack stand.

Here are the things I did while I was doing the oil pump:
1. cleaned all the intake parts (TB, all the air tubes, Idle air control valve, air flow meter)
2. replaced timing belt, all 3 front seals while I was there.
3. took out the cross member, sanded and re-painted.
4. replace all front old rubber bushings to poly bushings.
5. replaced ball bearings

After putting everything together yesterday, I installed a mechanical oil pressure gauge just to make sure I did the job right. I have my wife crank the engine while I was very closely watching the engine and oil pressure gauge. To my great joy, she started after a few turnovers (It used to start better before I took it apart) and the oil pressure reading is over 60 psi at about 2000 rpm with a cold engine. I was quite satisfied since it did start and the oil pump is working well now, although it won’t idle right.

Here are the symptoms: As I turned the key and the engine starts, it revs at about 2000 rpm for a few seconds and then as it drops down to about 1000 to 1500, it starts to struggle. I hear some (not all the time) quite loud pops inside the intake and maybe hissing. Most of the time it just dies at this point. If I open the throttle soon enough, and maintain the engine speed at above 2000 rpm, it runs quite smoothly with out any problem. Then it struggles and dies as soon as I let go of the throttle.

There is no error code stored in the OBD.

Do I have an idle (IAC and AMM, vacuum leak, etc.) or do I have a timing issue here? I did a few timing belt jobs over the past 3 years since I got my first red-engined Volvo. It always starts and runs well afterwards. The loud popping sound this time really made me concerned. Please help me get to the right direction. Thanks and Merry Christmas. Erwin





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