Shaking with misfire

SKEPTICHAN

MEMBER
1997 TOYOTA 4RUNNER
3.4L
6 CYL
4WD
AUTOMATIC
320,000 MILES

Driving down the road and the car was shaking pretty vigorously. I started to do some looking around under the hood and checked the vacuum lines. Just was thinking is was a fuel injection problem on number 6. If you have any information on some good ways to make sure it’s this or it could be something else. I could try to see if the ohms are reading good I think it should be somewhere around 16. Let me know if you have any suggestions on what this could be.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,758 POSTS

Hi,

It could be a couple things. Here are the directions for testing the injector. The attached pictures correlate with the directions.

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1997 Toyota Truck 4 Runner Limited 4WD V6-3.4L (5VZ-FE)
Injection Inspection
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Injector Testing and Inspection Component Tests and General Diagnostics Injection Inspection
INJECTION INSPECTION
FUEL INJECTOR INSPECTION

pic 1

1. Inspect injector resistance.
Using an ohmmeter, measure the resistance between the terminals.

Resistance: At 20°C (68°F): Approx. 13.8 ohm

If the resistance is not as specified, replace the injector.
2. Inspect injector injection.

CAUTION: Keep injector clear of sparks during the test.

(a)Disconnect the fuel inlet pipe from the fuel tube.

Pic 2

(b)Connect SST (attachment and hose) to the fuel tube. SST 09268-41046 (09268-52011)
(c)Connect the fuel return hose, SST (union) and SST (hose) to the fuel pressure regulator. SST 0926841046 (0926841091)
(d)Install the 0-ring to the injector.

Pic 3

(e)Connect SST (union and hose) to the injector, and hold the injector and union with SST (clamp). SST 0926841046
(f)Put the injector into the graduated cylinder.

HINT: Install a suitable vinyl hose onto the injector to prevent gasoline from splashing out.

(g)Connect the TOYOTA hand-held tester to the DLC3.

Pic 4

(h)Connect SST (wire) to the injector and battery for 15 seconds, and measure the injection volume with a graduated cylinder. Test each injector 2 or 3 times. SST 09842-30070

Volume: 55 - 70 cm. Cube (3.3-4.3 cu. In.) Per 15 sec.

Difference between each injector: 6 cm. Cube (0.4 cu. In.) Or less

If the ignition volume is not as specified, replace the injector.

Pic 5

3. Inspect leakage.
(a)In the condition above, disconnect the test probes of SST (wire) from the battery and check the fuel leakage from the injector. SST 09842-30070

Fuel drop: 1 drop or less per minute

(b)Turn the ignition switch to LOCK.
(c)Disconnect the negative (-) terminal cable from the battery.
(d)Remove SST
SST 0926841045
(e)Disconnect the TOYOTA hand-held tester from the DLC3.

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Let me know what you find or if you have other questions. Also, if you have a live data scan tool, let me know what the short term fuel trims are.

Take care and God Bless,

Joe

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