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Ask Lou P. master tech Your Own Question
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3933
Experience:  15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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My 1999 slk230 won't run hardly at all. when 1st crank revs

Customer Question

my 1999 slk230 won't run hardly at all. when 1st crank revs up for a few seconds then will not accelerate fumbles like out of fuel pressure. I noticed the supercharger was loose but I bought a new engine with supercharger with half my miles and replaced engine. before I changed the engine we replaced the fuel pump and the filter with no effect. help (###) ###-####
Submitted: 10 months ago.
Category: Mercedes
Expert:  Lou P. master tech replied 10 months ago.

Hello, so to be on the same page, you are saying the same issue was there before and after engine replacement ?

Customer: replied 10 months ago.
Expert:  Lou P. master tech replied 10 months ago.

ok, so one word replies are going to drag this out for the both of us, so please be as detailed as possible,

did you swap ANYTHING from the old engine to new?

was there a check engine light on before the engine swap?

Customer: replied 10 months ago.
no engine lite changed no old sensors to replacement engine only left something that looks like a filter of some sort on top of drivers fender well going to fuel system. not sure what it is. after start the acc pedal control moves but engine runs at below idlee and will not rise
Customer: replied 10 months ago.
you can call me at(###) ###-####
Expert:  Lou P. master tech replied 10 months ago.

OK do you have a scan tool ?

and we cannot do a phone call without doing a phone service also i cannot call until after 4pm as i also work through the day

Customer: replied 10 months ago.
but was reading no codes
Expert:  Lou P. master tech replied 10 months ago.

i understood no codes. :)

what kind of scanner is it, does it read live data?

Customer: replied 10 months ago.
reads only engine off but pretty good tool also reads abs ssystem
Expert:  Lou P. master tech replied 10 months ago.

only engine off? that is weird, what happens when you try with engine on and running?

Customer: replied 10 months ago.
never tried only with ignition on but not running
Expert:  Lou P. master tech replied 10 months ago.

ok, what is the make and model of the scanner so i can see what its capabilities are

Customer: replied 10 months ago.
cen-tech 60794
Expert:  Lou P. master tech replied 10 months ago.

ok thanks,i see it

so you start the car, it runs ok at idle but when pressing the gas it doesnt accel correctly? is that correct?

Expert:  Lou P. master tech replied 10 months ago.

considering you swapped the entire engine and sensors that tells me its not the engine or sensors obviously, and since you have a new fuel pump that rules that out, so the next thing i would ask you to do is to loosens the exhaust, from the manifold to the exhaust, loosen it up and see if it runs now.

Customer: replied 10 months ago.
it only runs fine for about 10 seconds then does not barely run
Customer: replied 10 months ago.
ok ill try that guess it could be catalytic convertor but this just started all at once it was not a gradual thing
Expert:  Lou P. master tech replied 10 months ago.

sometimes the converter breaks internally and clogs the output. but that is where i would start.

BUT i need to know any other odd ball things that may be happening as well, or any items you may have swapped over from the old engine if ANYTHING

Customer: replied 10 months ago.
thanks, ***** ***** as I finish checking it out I will get back with you.
Expert:  Lou P. master tech replied 10 months ago.

OK no worries, i will get emails when you reply and i will always reply. let me know and we can try other things.

Expert:  Lou P. master tech replied 10 months ago.

so was my info helpful?