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Subject: start with a few easy diagnostics Author: johnhstein as johnhstein, 85-M6CSi, 85 745i (moderator) : member since July, 2004 : 586 posts Posted on: 2009-10-06 15:52:42

Someeasy things to check.

1. There MUST BE NO air leaks (period) between the AFM and the intake.

2. Do you have the OEM plugs. If not get a fresh set of OEM Bosch plugs.. Don't waste your money on the fancy four-prong platinum crap. They are a waste of money and after a few weeks, youprobably would not pass an emissions sniff test.

3 How old is the o2 sensor? If a 1-wire, and more thant 40k miles old, get a new one. If a 3 wire and more than 80k miles, get a new one.

4. Dribble some water near the injector base. if it gets sucked in, youhave leaky injector seals. Best choice get the injectors cleaned, rebuilt and blue printed at RCENG.com. They are the best. Period.

5. Read the voltage at the o2 sensor withthecar fully warmed.

Now disconnect the o2 from the motronic and take another reading.

What are they.

6. To check to see if the fuel pressure regulator is regulating, disconnect the o2 sensor, get the reading, then disconnect the vac line from the FPR. The voltage should go up. If it does not, change it.

7. Have youever adjusted the valves? That alone will make a WORLD of difference.

js

Regards

John Stein
Your Next Vacation
http://www.vrbo.com/169455

• Idle quality - What to expect? - peeeot 2009-10-06 11:29:25 (177 views)
  • Ready to clean injectors, finally. - peeeot 2009-11-12 18:32:35 (16 views)
  • Update again. - peeeot 2009-10-24 19:13:42 (58 views)
    • Valve Cover & Oil Pan Bolts - Area52 2009-10-25 18:15:27 (83 views)
  • These plugs should be fine, right? - peeeot 2009-10-22 11:26:53 (48 views)
  • Re: Idle quality - What to expect? - elbiera 2009-10-21 17:50:01 (75 views)
  • Intake job complete, negligable improvement. - peeeot 2009-10-12 14:24:29 (73 views)
    • need a few readings .... - johnhstein, 85-M6CSi, 85 745i 2009-10-12 15:37:24 (79 views)
      • I have some readings. - peeeot 2009-10-13 20:00:08 (85 views)
        • good stuff and helpful .... - johnhstein, 85-M6CSi, 85 745i 2009-10-14 12:43:51 (93 views)
          • Thanks for all the quality information! - peeeot 2009-10-14 15:39:24 (105 views)
            • all good questions - johnhstein, 85-M6CSi, 85 745i 2009-10-14 16:15:41 (61 views)
              • Checked the HVAC. - peeeot 2009-10-15 12:59:51 (82 views)
                • yup, that leak rate is negligible.... :-) (nt) - johnhstein, 85-M6CSi, 85 745i 2009-10-19 10:09:25 (55 views)
  • I found my problem. - peeeot 2009-10-07 15:47:49 (150 views)
    • Anyone know where to buy the IACV to manifold hose? I can't seem to find it. (nt) - peeeot 2009-10-10 01:03:25 (83 views)
      • Re: Anyone know where to buy the IACV to manifold hose? I can't seem to find it. - kff 2009-10-10 10:27:56 (102 views)
    • Consider the easy quick fix... - johnhstein, 85-M6CSi, 85 745i 2009-10-08 09:06:09 (111 views)
    • Re: I found my problem. - limeyexpat 2009-10-07 21:19:12 (70 views)
    • Re: I found my problem. - Hitmanx 2009-10-07 16:51:27 (117 views)
  • Re: Idle quality - What to expect? - Hitmanx 2009-10-07 12:30:46 (93 views)
  • start with a few easy diagnostics - johnhstein, 85-M6CSi, 85 745i 2009-10-06 15:52:42 (157 views)
    • Re: start with a few easy diagnostics - peeeot 2009-10-06 20:17:00 (103 views)
      • I'd lay next a good bet - johnhstein, 85-M6CSi, 85 745i 2009-10-07 07:01:48 (96 views)
  • Some of my observations (pic) - demet 2009-10-06 14:40:56 (213 views)
    • You run without your O2 sensor? - peeeot 2009-10-06 18:33:33 (95 views)
      • These cars .... - johnhstein, 85-M6CSi, 85 745i 2009-10-07 07:13:24 (115 views)
      • keep in mind that the US 733i only had a - sfdon 2009-10-06 20:09:21 (130 views)
      • Some answers... (url) - demet 2009-10-06 19:14:09 (126 views)
        • Re: Some answers... - limeyexpat 2009-10-07 00:38:25 (123 views)
        • I checked my switch out. - peeeot 2009-10-06 20:06:31 (82 views)
          • Other possibilites... - Area52 2009-10-06 23:46:20 (77 views)
            • Are leaking injectors a common problem? - peeeot 2009-10-07 00:12:27 (78 views)
              • Re: Are leaking injectors a common problem? - Area52 2009-10-07 08:44:01 (95 views)
            • Doh!... - Area52 2009-10-06 23:49:55 (84 views)