natecr

well i have an 87 toyota 22r 4x4 pu

the motor has a problem it likes to backfire in between shifts and is defintly running rich.

what are the things i could do or check. im new to toyota not to cars. im used to working on jeeps and such just need some help thanks guys

abecedarian

is your check engine light on?
you said 22r, not 22re so timing, vacuum leaks, ignitor, caburetor, air-injection system.

CyMoN

mine did the same thing I almost positive it was the fuel cut solenoid on the carb that and the choke had been messed I found a used one at the Upull for 20$ it solved my problems but now I have other minor ones I am trying to figure out.

natecr

it was a vac leak.

i un hooked the hose that goes to a valve that controls this 3/4in hose that has vac that goes to the air cleaner and it stopped backfiring and running as rich so im assuming there is a vac leak somewhere and this is a temp fix till i find it. any ideas?

natecr

is there any popular places for the motor to lose vac?

abecedarian

grab a can of wd-40 or similar and spray in short bursts on the hoses when the engine is running. the engine speed should fluctuate when you spray near a leak.

natecr

still running a bit rich and it is missing a bit too..

compression is within 15psi from each other with the low being 150 is that OK?

but i dont know where to go from here i know its running rich and i have checked all the vac lines.

abecedarian

you mentioned the diverter valve- it has the vac hose and 3/4 hose that goes to the filter... it's possible that it is malfunctioning or the vacuum switch that controls it is. air-pumps / air-injection systems are notorious for causing backfiring when they malfunction.

also, isn't there a dashpot on the carburetor that keeps the throttle from quickly slamming shut when you let off the throttle? I believe part of it's function was to prevent backfiring.

DOLO

bumping for results:
my 90 22R is doing the same thing and I'd hate to burn up the valves since I just got the truck.

abecedarian

90 22r? do you mean 22re?

DOLO

nope. 22r.

abecedarian

where are you at?

DOLO

I'm in Hawaii. btw, it's a 2wd. My 89 4wd is 22re.

abecedarian

didn't know you could get a carbureted toy in the US in 90.
my bad.

DOLO

That could be true for mainland U.S.. I'm not sure about Toyotas but I know that here in Hawaii, Suzukis and Hondas came straight from Japan market. That may be true for Toyotas too. I know once I contacted Suzuki MotorCorp for a paint code for my bike and was referred to their offices in Japan.

I guess it's cheaper to ship from Japan than it is from mainland U.S.

DOLO

back to topic:
someone mentioned the air pump/ air injections system. How would I go about checking that?

abecedarian

paint is not the same as smog.

abecedarian

if it is carb'd, find a diagram for a late 80's carb'd truck with the air pump. there is basically a diverter valve that either puts the air from the pump into the intake or exhaust depending on engine vacuum.