'91 4Runner is flooding engine

[Raszr]

I have a '91 that seems to be flooding the engine with fuel. I was running fine then I started to smell excess gas and it died. Now I go out and crank...crank...crank and nothing. But again I smell gas like Ive been pumping the pedal and flooding it.

It even had raw gas in the exhaust pipe when I was under the car looking around some dripped on me.

It has spark, new wires (correct order), plugs, cap and rotor. TIming was checked.

Any suggestions???? What can I check???

 

[2ndGenToyotaFan]

Pull the trouble codes. Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical

That's a lot of raw fuel if it's running out the tail pipe.... Something drastic must have happened.... Have you noticed a drop in fuel mileage lately? Or did it just up and die?

 

[meigsrock]

Forgive me here for not being pickup related but I have a similar problem too.

My 1990 1.6 I-4 efi toyota carolla is doing a similar thing. It is running way ritch and fowling up the plugs. Smells a bit like excess fuel, oil smells like fuel. It has trouble starting sometimes and if it does it just wants to keep dying. Some times it starts right up and will idle just fine but if you try to drive it down the block the it will die on you. Let it sit for a bit and it starts but drive another fiew blocks and it dies again.

I also just replaced plugs, rotor, cap, wires, airfilter, just to be sure. I also looked for cracked or loose hoses creating a vacume leak but did not see anyting ovious.

My two though are a bad Mas airflow sensor/meter or possibly bad injectors. I am guessing that it is not the injectors in mine because they are all fouled ritch with gass about the same.

I just got some Mas airflow sensor cleaner and will try that tomarrow.

I don't have tools to get trouble codes so I will try the cleaner first. Any otehr possible suspects that anyone can think of that may help us? What about a bad O-2 sensor in the exhaust pipe? would that cause it?

Anyone know of a good company or place to get a good code reader for the hobby mechanic for 1980-1990s toyotas.

 

[2ndGenToyotaFan]

Anyone know of a good company or place to get a good code reader for the hobby mechanic for 1980-1990s toyotas.

Any office supply store should carry paperclips..... Check out the link I posted.

My suspicion is a bad control issue, O2 sensor, or air flow meter come to mind first.

 

[Bogo]

meigsrock, go to the troublecode site linked above and follow the procedure. Find the connector in your vehicle. On my pickups it is at one end of the fuse block in the engine compartment and has a cap over it to keep it clean. Follow the procedure for reading the codes. To jumper the two pins I use a bent wire paper clip. It may be best to locate a Field Service Manual (FSM) for your particular vehicle as some Toyotas have slightly different meanings than the site lists for some of the codes.

 

[rchalmers3]

I'm feeling a bit overwhelmed at the moment with a pair of 4Runners with fuel contaminated oil, hard starting, poor mileage, fuel smell on starting and so on. One is a "86 22R-E and the other is a "93 3VZ-E. Neither vehicle has the "Check Engine" light set after starting.

I have not pulled codes on the '86, however the '93 flashes all clear (rapid, steady flashing). Therefore I must assume I am looking for problems outside the ECM control. My thoughts are:

** Excessive fuel pressure
** Leaking injector(s) AND dead O2 sensor
** Leaking cold Start injector (how to test?)
** CTS open circuit (temp gauges reflect proper operation)
** Airflow meter signaling incorrectly (interested in diagnostic info on this)
** Something crazy, for example a double firing ignition trigger???
** Or???

Any ideas or suggestions are encouraged. Since these vehicles have computers that are ignoring the over rich condition, I am expecting to find multiple issues. However I need a suggestion on how to build a foundation to work from.

I drained a lot of expensive fuel out of the oil pans of both vehicles and am worried about the long term affects of fuel rinsed BEB's!

I can connect my fuel pressure gauge to the V6 at the rail next to the FPR, but I am lacking an M8x1mm banjo bolt fitting with schrader for the 22R-E. I'll work on fabbing something up unless someone knows where to source one. Darned if I'll work on the 22R-E filter banjo's!!! That filter is a bugger to get to.

Again, any experience is welcome.

Rick

 

[2ndGenToyotaFan]

Excessive pressure seems unlikely unless you have a blocked pressure regulator... I would lean towards leaky injectors. Have you checked the cylinders individually to see if they all are getting wet?

 

[rchalmers3]

2ndG, you are correct, at least on the "93. The '86 is up on the upper forty until I have more space in my work area. I was able to spend quality time on the '93 however and the fuel pressure measures at the top end of each spec, as per the FSM:

(o) Disconnect the vacuum hose from the pressure regulator and plug it closed.
(p) Measure the fuel pressure at idling.
Fuel pressure: 265–304 kPa
(2.7–3.1 kg f/cm2, 38–44 psi) (Measured 44 psi)

(q) Reconnect the vacuum hose to the pressure regulator.
(r) Measure the fuel pressure at idling.
Fuel pressure: 226–265 kPa
(2.3–2.6 kgf/cm2, 33–37 psi) (measured 38 psi)

Working on the "93 today, I was baffled by a no start condition when I had both spark and fuel pressure. Cranking speed and cadence was normal, so the timing belt was not a suspect. After a lot of wasted time testing a working ignition system, I dumped the oil, refilled the engine with fresh oil and started the engine while holding the gas pedal to the floor. The engine cranked for about 10 seconds then started with first a big puff of black smoke followed by white smoke for a few minutes. It's been a LONG time since I had to do that to start a car! My skills are a victim of these reliable machines!

I expect to uncover leaking injectors. I have my pressure gauge connected while the car sits overnight in order to view the change in rest pressure. I realize the FP may have some leakage that will allow the rest pressure to drop, but I am looking for any details that give me direction. I did not pull the spark plugs yet, but will do so after I see a dramatic loss of rest pressure overnight.

Your mention of a blocked FPR seems unlikely given the variance of the fuel pressure when the engine was running and I could stuff the throttle and watch the pressure change according to engine intake vacuum.

Given the other symptoms this car exhibits, (stalling, hesitating, hard starting, high idle speed) I believe I'll test the Volume Air Flow (VAF) meter as well. If you have any other usual suspects that show up on this forum, please let me know.

I am not sure the owner of this car will pony up for 6 or 7 injectors, along with an oil and filter change and replacement of the secondary ignition parts. If I get to see the job through I will of course post up. If not, then at least I will have brought a little more understanding to the world of
Toyota EFI understanding...

Rick