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Old 03-14-2019, 11:32 PM
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94 w140 s320 won't start

Hi I obtained a 95 Mercedes s320. Car cranks but doesn't start. So far I replaced the fuel pump since old pump was bad and drained/replaced 5+ year old gas. Checked fuel pressure at fuel rail and it's around 55 psi. Spark plugs, ignition coils are good and I'm getting spark. I checked camshaft and crankshaft sensors, they are good and sending a signal to ECM. Checked for common ground on sensor wiring and ground is good. Car starts with starter fluid when sprayed into throttle body. At this point I'm assuming the injectors aren't firing and I'm thinking it's the ECM. Do you think my findings are right? Or I still need to further troubleshooting?
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Old 03-15-2019, 05:52 AM
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check your wiring,and throotle body wiring.Ignition switches go bad,and the k38 starter interupt relay too.somewhere under carpet near gas pedal,on trans hump
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Old 03-15-2019, 05:54 AM
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k38
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Old 03-15-2019, 05:58 AM
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another area for relay is behind fuse box under hood,its pink.The whole cover will come off.I had to replace mine,Benz tech's did not know about it.
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Old 03-15-2019, 12:13 PM
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Quote:
Originally Posted by oldsinner111 View Post
check your wiring,and throotle body wiring.Ignition switches go bad,and the k38 starter interupt relay too.somewhere under carpet near gas pedal,on trans hump
Wiring harness was replaced by previous owner. As far what I've seen it's not a electric throttle body, it has a throttle cable. I've checked that relay and it's still good but I'll recheck it and try to swap relay with my 96 w140
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