Seedy Al Posted September 2, 2015 Share Posted September 2, 2015 Hey beards I have a 1992 merc SL500 here, that wont run. It was running for a bit but pretty rough, owner gave it a blast out and it died on them and now wont run again. Have good fuel pressure fuel up to the distribution block, but nothing coming out at the injector end Any ideas on what I should be tackling here? Im weary about pulling the block apart, as rebuild kits seem to be ex Ebay only (unless someone knows a place in nz to try?), however I have read they can be troublsim, filling up with crap etc so any wizards have any ideas? thanks in advance Allan Quote Link to comment Share on other sites More sharing options...
kyteler Posted September 2, 2015 Share Posted September 2, 2015 Maybe give Borgy a PM? Quote Link to comment Share on other sites More sharing options...
Testament Posted September 2, 2015 Share Posted September 2, 2015 crank position sensor? 1 Quote Link to comment Share on other sites More sharing options...
tim13 Posted September 2, 2015 Share Posted September 2, 2015 hi Al , 9 out of 10 times it is distributor caps & rotors they will be full of green shit , clean em out if it runs ok order new , startech in auckland is your best local option . fuel distributors and injectors are almost never an issue , pumps and relays sometimes are , and vac leaks and wiring looms occasionally too ........ you wait till you get asked to sort the roof ! Quote Link to comment Share on other sites More sharing options...
fletch Posted September 2, 2015 Share Posted September 2, 2015 Seen failed coils on this age merc. Also blocked solid cat. Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted September 2, 2015 Author Share Posted September 2, 2015 has spark, so probably rules out crank angle sensor, and caps and rotors Cracked the fuel lines to the injectors, fuck all coming out Fuel pumps are working based on the amount of fuel pissing out everywhere before the distributor block Quote Link to comment Share on other sites More sharing options...
Alfashark Posted September 2, 2015 Share Posted September 2, 2015 Call Steve at MercWorx - He knows his shit. http://www.mercworxs.nz/ Quote Link to comment Share on other sites More sharing options...
tim13 Posted September 2, 2015 Share Posted September 2, 2015 has spark, so probably rules out crank angle sensor, and caps and rotors Cracked the fuel lines to the injectors, fuck all coming out Fuel pumps are working based on the amount of fuel pissing out everywhere before the distributor block fuel leaks ? or when you loosen ? only ever trickles out of line to injector . pull caps off for a look cause they tend to crossfire on the shit that grows in them resulting in spark but not timed so wont go how does the wiring look ? insulation falls off the wires on them ! Quote Link to comment Share on other sites More sharing options...
Testament Posted September 2, 2015 Share Posted September 2, 2015 has spark, so probably rules out crank angle sensor, and caps and rotors Cracked the fuel lines to the injectors, fuck all coming out Fuel pumps are working based on the amount of fuel pissing out everywhere before the distributor block have you checked the codes? there is a connector that can do some flashing light code things on these, on my W124 it was by the fuse box in the area just behind the RH strut tower http://www.mercedes.gen.in/WP35/mercedes-older-series-diagnostic-fault-code-reading-w124-r129-others/ Quote Link to comment Share on other sites More sharing options...
MercedesGenIn Posted September 4, 2015 Share Posted September 4, 2015 Hi there, I would have a look at the fuel rail pressure regulator. This is vacuum controlled to some degree. A loss of vac at this point, split in a hose or more likley a faulty reg could cause you fuel delivery issues. Reading the whole thread again you seem to have the k-jetronic mechanical injection system and I first assumed the later electronic type so you will not have a rail regulator. You need to focus at reasons for the distributor not doing its stuff. I will see what I can dig out on k-jetronic when back next week. Regards Steve Quote Link to comment Share on other sites More sharing options...
Borgweiser Posted September 4, 2015 Share Posted September 4, 2015 ECU fault BOI When you turn the key does the economy gauge move when cranking? If not or it's erratic that can be a sign of connector issues. Also, have you got the fuel pressure gauge on it? You need the full working pressure from both pumps to get through the fuel distributor or it will just cycle back to tank. I have the new genuine pumps here going cheap Otherwise the ECM or the OVP relay play up, that's the one with the red fuse on top, if that fails there will be low voltage to the fuel pump. It's very rare for things to go wrong with the fuel distributor, very. Also they hardly ever come apart without brute force and butchery. Also check to make sure no one fiddled with the mixture adjustment screw, they are set on a factory jig and only a quarter turn is up to 40% out on HC readings, if someone tried to tune on low fuel pressure you're in for some fun.... Giz a yell if you ever need K-Jet advice. Quote Link to comment Share on other sites More sharing options...
Testament Posted September 5, 2015 Share Posted September 5, 2015 1992 r129 sl500 should be all electronic hfm system shouldn't it? Got any pics Allan? Quote Link to comment Share on other sites More sharing options...
tim13 Posted September 7, 2015 Share Posted September 7, 2015 hey Al ; is it going ? who was right / best guess ? dont make me come up there ! Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted September 9, 2015 Author Share Posted September 9, 2015 so, i just got a chance to play with this this afternoon pulled the caps and yes water and crap in there, cleaned the contact points for the leads in the caps the best i could, reassembled still no go, so pulled the new plugs and they are a bit fuel covered on some but not all, really, and some where showing signs that they were firing so cleaned them and wound it over with no plugs, got a bunch of crap out iof the right bank. reassmbled, still no go. however there is popping coming out the exhuast, and sometimes through the intake flappy thing i guess this could signal that its cross firing, but im not overly keen spending money on new caps and rotors on a whim. so thats where im at lol. Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted September 9, 2015 Author Share Posted September 9, 2015 tempted to drop off exhaust. but seems weird as the guy was driving it when it conked out on him. Quote Link to comment Share on other sites More sharing options...
kyteler Posted September 9, 2015 Share Posted September 9, 2015 Timing? Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted September 15, 2015 Author Share Posted September 15, 2015 Hey hey hey! Would like to thank everyones help Yes it turned out it was the caps and rotors So I have learneded. Yeah so glad its out of my life Quote Link to comment Share on other sites More sharing options...
Nominal Posted September 16, 2015 Share Posted September 16, 2015 http://www.trademe.co.nz/motors/used-cars/mercedesbenz/auction-950382621.htm Quote Link to comment Share on other sites More sharing options...
tim13 Posted September 16, 2015 Share Posted September 16, 2015 ooooohhhhhhhh , do I get a prize ? , glad its sorted buddy Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted September 16, 2015 Author Share Posted September 16, 2015 yeah thanks Tim, was super handy advice Hah, don't show me that merc, its owned by the same place I fixed this one for lol Quote Link to comment Share on other sites More sharing options...
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