Subject: Re: Hmmm, need some troubleshooting help (a little long) Author: paulmer : member since January, 2008 : 1258 posts Posted on: 2009-09-30 23:08:01

I experienced a lot of rough idle issues (and sluggishness issues) with my car for a long while. Glad they are behind me..

My steps:

- Replaced fuel filters. Immediate improvement, if you haven't, DO IT
- Clean spark plug wells, spark plug boots
- Fresh air filter
- Cleaned ICV
- Cleaned TB
- Cleaned MAF
- Took off intake manifold and wiped it down, there was lots of oil

All of these are free (except air filter + fuel filters which cost like 30 bucks) and netted me a large improvement. The only things which didn't afford me much change (if any) were cleaning the MAF and dumping in some techron in the tank.

But if you are having issues with bad mixtures, I'd say clean the MAF. I'd advise using CRC Mass Air Flow Sensor cleaner...many have used rougher solvents, but I wouldn't!

I assume you replaced the fuel injector o-rings? When you bought the fuel injectors, were you given a flow sheet for them? Most re-builders do, I wouldn't bother with anyone who doesn't..

Also, I take issue with "shogun troubleshooting"..the tips he has are intended to prevent you from blindly replacing parts and hoping the issue goes away

------
1994 BMW 740iAL (prod 10/11/1993) (vin: *DE89667), Schwarz 2 (668), Pergament leder (0440), 142,xxx miles.

"We all pay for life with death, so everything in between should be free.” ~ Bill Hicks

Checkout my archive of E31, E32 & E34 documents on my ftp. Included are electronic troubleshooting manuals for all E31, E32 & E34, various technical specs and wrenching instructions, BMW TIS/KSD/EBA/ETK, motronic roms and other goodies.

• Hmmm, need some troubleshooting help (a little long) - geerhed 2009-09-30 21:34:50 (152 views)
  • SOLVED? $8.19 - geerhed 2009-10-26 21:31:48 (4 views)
  • Re: Hmmm, need some troubleshooting help (a little long) - maun 2009-10-15 20:43:34 (14 views)
    • Thanks, Maun - geerhed 2009-10-24 09:10:00 (4 views)
  • Re: Hmmm, need some troubleshooting help (a little long) - maun 2009-10-10 21:52:38 (27 views)
    • OEM - geerhed 2009-10-15 19:17:20 (9 views)
  • Checked MAF, changed O2 Sensors; no change - geerhed 2009-10-08 19:36:32 (60 views)
    • Re: Checked MAF, changed O2 Sensors; no change - paulmer 2009-10-10 00:07:51 (32 views)
  • d2 'CAN message' (what's that?) - rv8flyboy 2009-10-01 10:58:39 (47 views)
    • Re: d2 'CAN message' (what's that?) - geerhed 2009-10-01 11:10:27 (44 views)
  • Re: Hmmm, need some troubleshooting help (a little long) - skucera 2009-10-01 00:45:13 (77 views)
  • Re: Hmmm, need some troubleshooting help (a little long) - paulmer 2009-09-30 23:08:01 (82 views)
    • NOT 'Shogun' Troubleshooting, SHOTGUN Troubleshooting!!! - geerhed 2009-10-01 10:20:52 (55 views)
      • For a moment there, I thought Shotgun troubleshooting was... - bcweir750 2009-10-10 15:13:29 (40 views)
  • make a MAF sensor test - shogun 2009-09-30 22:48:10 (103 views)