why is my 96 neon getting bad gas mileage (120-150 miles on full tank) and driving at higher than normal rpm?

Asked by Nov 19, 2015 at 10:38 PM about the 1996 Plymouth Neon 4 Dr Highline Sedan

Question type: Maintenance & Repair

The catalytic converter was completely
plugged, so i removed it and ran a straight
pipe. I put new plugs and wires. Installed
new fuel pump and filter. Ran sea foam
through it with premium gas. Replaced oil
pressure sending unit (it was leaking). New
oil and filter. Sprayed some carb cleaner
through the throttle body while it was
running and had someone give it a little gas
so it wouldn't stall out.

I believe the car to have 70k or less miles.
The speedometer/odometer works off and
on and is only at 57k. But the car is pretty
clean under the hood for a 96.

I have to almost stomp the gas to get it
moving sometimes. It accelerates okay
through 1st and 2nd but from 2nd to 3rd the
rpms drop and i have to press the gas pedal
more to speed up. When i do that it jumps
to 3500-4k rpms until it hits the next gear. It
drives at about 2000-2500 rpms when
driving down the road at 35-45. On the
highway it drives from 3k-3500 to maintain

I know the rpms are higher than normal and
the car seems to be working too hard.

When the rpms jump up high while
accelerating, i can see a cloud of smoke in
my rear view mirror (granted the converter
is removed).

I think its gotta be the map sensor, throttle
body, or injectors. Or possibly the O2
sensors. I just don't know how to pinpoint
the problem. Id replace everything, but ive
already put a lot of money into it, and new
injectors are expensive.

Im going to hook it up to a code scanner in
the morning to check trouble codes. But
prior to all the repairs i did, it was getting a
misfire code and a code saying fuel system
too lean bank 2.

2 Answers


What color is the exhaust smoke? Black is running rich and blue is burning oil.

Its definitely black

Your Answer

Add photo

Related Questions

Search Plymouth Neon Questions

Plymouth Neon Experts

#1 Tom Demyan
Tom Demyan
Reputation 110
#2 Alex Olsen
Alex Olsen
Reputation 60
#3 SJonesyS23
Reputation 50
View All

Related Models For Sale

Used Honda Civic
824 Great Deals out of 83,792 listings starting at $750
Used Dodge Neon
672 listings
Used Pontiac Grand Am
4 Great Deals out of 1,139 listings starting at $1,000
Used Chevrolet Malibu
1,176 Great Deals out of 79,465 listings starting at $2,500
Used Hyundai Accent
175 Great Deals out of 12,025 listings starting at $1,495
Used Toyota Camry
1,203 Great Deals out of 83,221 listings starting at $750
Used Nissan Altima
1,268 Great Deals out of 74,639 listings starting at $1,000
Used Mitsubishi Galant
15 Great Deals out of 1,240 listings starting at $3,300
Used BMW Z3
9 Great Deals out of 268 listings starting at $2,500
Used Honda Accord
1,033 Great Deals out of 67,106 listings starting at $1,000
Used Dodge Dakota
128 Great Deals out of 3,788 listings starting at $1,500
Used Buick Century
858 listings starting at $2,300

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.