Scan it yet, a FULL OBD2 scan? why not?if not.
now is the time...
the 1.8L J18 engine, same as the older Sidekick sports used.
same engine , know it I do.
its the precursor to the J20, (j18 is under-stroked, j20 with many of the same parts. inside)
the back fire means explosion sound to rear end of tail pipe?
yes, that is rich raw fuel in the muffler. plus Air.
if there are exhaust cracks and then engine goes rich this can happen( a double failure)
if how ever BACK means, back to the Air cleaner, then that be different reasons, (timing)
engine now starts.?>
engine runs.? has full power, car drives ok.?
JUST?
SURGE,. you never said.
does engine get hot? 180F or more and holds (y/n)
ever get a full tuneup this decade,
most dont so i tell you, bad spark causes, misfire and raw fuel is wasted to the exhaust and sure can go boom.
surging usually means the ISC can not control idle
so it hunts, (a suzuki software engine on all 90s engines)
PCM errors, inside it. (dangerous too)
a modern car, if idle goes too high the ecu commands the ISC closed
and holds it there solid, (safe way , no hunting allowed now)]
so if this car surges, it's , lean engine.
some think flooding is surging.
and this is usually below 800 rpm,
almost stalls, then corrects, seems like a surge.
next time post rpm range of surge.?????
do not drive a surging engine, do not be like Toyota drivers. (over 800 rpm hot)
surge from 400 -800 rpm is class 1 surge.
surge from 800 to say 2000 RPM is class2, and very dangerous to some folks, (key off, get car fixed, tow it)
The ECU controls idle speeds. (hard coded servo controls)
SOURCE: 91 Camry surging
You maybe need to adjust the idle speed, on top of the intake manifold, near where it says EFI, there a small black rubber plug, pull it out, turn off everything in the car, then turn the screw in where the plug was to change the idle speed. Or it could be that you need a new Idle Control Valve
SOURCE: Car runs fine at idle but wants to surge
there is a fuel pump inside the tank that is bad replace it
SOURCE: High Idle speed on 1989 Merc Sable, 3.0L V-6. Approx 2000 RPM
My wife had a 93 ford tempo 4 cylinder with same problem.It turned out to be the idle air solenoid mounted on the air intake manifold.
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