Car: 1990 Acura Integra
Issue: when slowing down or removing foot from throttle car stalls out.
Car does idle perfectly at start up
Parts changed:
Distributor
Fuel filter
Fuel oump
Spark plugs
Spark plug wires
O2 sensor
Tps sensor
Did vaccum check
Did compression check 1: 120/ 2: 120/ 3: 120/ 4: 140
Any ideas would be great
Make sure you are using the correct spark plugs and make sure they are gapped correctly. The compression difference between each cylinder should be I think no more then 10 in difference.
i believe the rule of thumb is 10% variation from lowest cyl to highest cyl actually. i think
op, not indefinite, but the most likely cause of stall on decel is gonna be a dirty/carboned throttle bore.
service the throttle body. what i do is use a bottle brush and some intake cleaner. pull the intake boot, open the throttle valve and spray your cleaner in the bore and butterfly while scrubbing with the brush. fire up the car and spray in the bore, washing all the residue through the intake. you’ll need to work the throttle while spraying to keep it from stalling.
if that doesn’t fix it, service the iacv. i like to do this in vehicle. the iacv port is located in the throttle bore. if you have 2 ports in the bore, the iac will be the upper port. with the vehicle running, spray your intake cleanerdirectly into the port using the straw provided with the can. you really wanna work the throttle while spraying. working the throttle opens and closes the valve so the cleaner can really be worked into the valve.
i like to do it in vehicle because this way you clean out the port at the same time.
try those out and report back
[QUOTE=welfare;2305463]i believe the rule of thumb is 10% variation from lowest cyl to highest cyl actually. i think
op, not indefinite, but the most likely cause of stall on decel is gonna be a dirty/carboned throttle bore.
service the throttle body. what i do is use a bottle brush and some intake cleaner. pull the intake boot, open the throttle valve and spray your cleaner in the bore and butterfly while scrubbing with the brush. fire up the car and spray in the bore, washing all the residue through the intake. you’ll need to work the throttle while spraying to keep it from stalling.
if that doesn’t fix it, service the iacv. i like to do this in vehicle. the iacv port is located in the throttle bore. if you have 2 ports in the bore, the iac will be the upper port. with the vehicle running, spray your intake cleanerdirectly into the port using the straw provided with the can. you really wanna work the throttle while spraying. working the throttle opens and closes the valve so the cleaner can really be worked into the valve.
i like to do it in vehicle because this way you clean out the port at the same time.
try those out and report back[/QUOTE]
Already cleaned the throttle body, iacv, and the fitv. Nome of them solved the issue.
I have it at a shop now and we have narrowed it down to the injectors staying open. We are checking the computer, injectors, and injector controllor.
check the the pressure regulator. use a gauge. with gauge installed, pressure at idle should should be roughly 30-35psi. now, pinch the vac line leading to the reg. pressure should increase roughly 10psi. if it diesn’t, the reg or vac line to it is bad. if good, vac line pinched, give the throttle 3 quick snaps. pressure should drop no more than 3psi. if more than 3psi drop, pump is weak
what you really wanna do tho first is figure if it’s a fuel or ignition related issue. to do this, install a fule pressure gauge where you can see it while driving. induce the stall. pay attention to the gauge when the stall occurs. if the pressure drops off before the stall, problem is fuel related. if pressure holds during and just after, problem is likely ignition related. that’ll help to start narrowing the problem down