Ok so heres the deal i just picked up a 90 dx hatchback, and shes running very rich i can see her smoking and i smell the fuel. A full tune up has been done ( correctly ) and shes still running rich.

- I get hard starts ( are the cylinders getting flooded?)
- backfired a couple times right after the engine starts running
- all the old plugs were fouled with carbon
- smokes out the back at idle and while revving
- while revving a black fuely wattery substance blows out of the exhaust (good amount)


from what ive searched this is a pretty common problem, and ive heard of people have replaced the 02 sensors, cats, injectors, ecu's, and still nothing. i was wondering if replacing the PGM-FI relay should be the first step in tackling this problem, and also if the igniter and coil play a role in this aswell

THANKS IN ADVANCE

 

first i would make sure you are really running rich get the car on a 5 gas machine(sniffer) or hook up a Y band i smell fuel on my car all the time but i'm runnig lean at idle 16;1 a/f so make sure before and adjustments. first step in diagnostics is verfiy the complaint

 

What's your ignition timing set to?

 

smoking out the back is probably the valve guides, an it sounds like u might also have a bad main seal

 

if its a d15b2 its probrably oil your burning