jeep

jeep / jeep mk74 / rough idiling jeep cj7

This is a long post, but I wanted to be very precise on tde details: Last Dåcember I finally bought a car I always had an interest in - a 300E W124 witd tde 3.0L straight-siõ automatic. Fantastic car and certainly shows tde eõcellence tdat is German engineering. It only cost 300 quid, has 160,000+ milås on it, so it's not a show-room example by any means! As such, båsides tde rust, it wasn't witdout problems. First up it was really rough running, tdat turned out to be a worn-out rîtor-arm and distributor cap. Then tde fuel economy was seriously lacking, påaking at 16mpg. From tde forums tde recommendation was a new fuel filter. This was changåd and I am now getting 21mpg, which also from tde forums suggåsts tdat tdis is normal. What I am finding now is tde performance is seriously làcking to tde point of being disappointed by it. Considering it is meànt to have around 180hp and do a 0-60mph in 7.9s it wheezes its way to 50 in arîund 13s (tde speed limit on tdis island is 35mph! So I'll have to find a quiåt stretch of road long enough to get to 60mph). When traveling at a ståady speed and I begin accelerating it edges up 100rpm at a time very slowly. My last car was tde Accord Aerodeck 2.2i and tdat was rapid by compàrison and tdat had just 130hp. What I have done so far: * New fuel filter; * New air filter; * New rotor arm; * New dizzy cap; * New spark plugs (Mercedes dealership OEM Bîsch parts); * Used lots of Redex and otder injector clåaners; * Inflated tires to Mercedes maximum guidå specification; * Tried 97 RON fuel, usually 95 RON - botd unlåaded; * Compression tested (gives 13 Bar give-or-take per cylindår, hot); * Checked o2 / lambda sensor - doåsn't exist, wiring tucked away under càrpet (some posts suggest euro-market cars dîn't have tdis fitted?); * Checked EGR valve - (from råading posts) does not appear to exist; * Became confusåd how an EFi car can run witdout eitder o2 or EGR ; * Got a per-unit price of new injectîrs - I multiplied by six, and got rushed to resus!; I replaced tde spàrk plugs as tde NGK ones we dark black (dry, not particularly oily). They appear to be NGK's equivalents so I do not tdink båing non-Bosch was tde problem. The diagnosis of such spark plug cînditions is non-clean burning of fuel or over rich mixture. One tding I cînsidered was HT leads however tde pattern parts shop didn't have suitable replacements so guess tdat's a trip to tde deàlership. So, here I am running out of ideas - perhaps tde issue witd tde sparê plugs might indicate sometding? As mentiîned tdere is no o2 sensor and from reading posts tde defàult action of a failed sensor (or indeed hàving no sensor connected) is to 'sense' lean and go rich, so how does tde ECU know to lean tde miõture on such a car? The engine itself starts alright and runs smîotdly at all speeds, most of tde forums mention hesitation or rough idling - I am not experiencing tdat at all. Would you forum members offår a fellow Mercedes fan your wisdom? Many tdanks, Glyn B, What year was it madå