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W124/E320 Coupe hesitation and wobbly idle
Hi all, I have a 1995 E320 coupe, UK spec (so cable throttle and no LED/push switch and nothing on port 14 etc), 105k miles.
I have a couple of problems which I hope you can help me with (possibly related?)! The car has a wobbly idle when hot - RPMs stay at about 600 but irrelgular "beat" to the idle which can be heard through the exhaust and also "wobble" the car. Accelerating fairly quickly, the car has a flat spot/stumbles 3-3,500 RPM and then "takes off" at around 4,000 RPM - feels like my wife's VW turbodiesel hitting the turbo...makes the car feel unresponsive around 70/80 in 4th on the motorway. Also, shift from 2->3 snatches a bit although 3->4 is smooth - seems to need a lot of throttle (even on a steep hill) to make the box drop 4->3 - can't see any vacuum pipe issues but there's a whole lot of pipes! Haven't yet cleaned out the EGR port (no fault code to indicate I need to?). Wiring harness is new (2 years) and the insulation on the coil feeds is clean and supple. PO supplied invoice showing 3 x new coils last year plus an ECU recon ("output stage blown by faulty coil" according to the invoice). The car is new to me and sat for over a year as its PO was ill. I have done the full B service as per the book plus trans fluid and filter, correct new Bosch plugs and resistor caps, cleaned the (filthy) throttle butterfly, checked MAF (clean), cleaned the intake temp sensor (filthy). I also sat and cleaned up the fuse box connectors and fitted all new fuses (the old ones were corroded). OVP is part number 000 540 67 45. No rattles and solder inside clean and shiny, checked the gap - clean (also no ABS light except at switch-on). Reading codes, there is just one on pin 8 - code 32 (which I can't find listed). What should I check/do next? |
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