Cranks, has fuel, air, spark, no start.

[eanema]

Yes, i found this issue on my 98, posted a pic here with the missing tooth pointed out:
https://www.toyota-4runner.org/3324431-post69.html

But I found that the engine would start and run extremely rough, then die all in about a second. I couldn't run the engine for more than a moment. Definitely worth a look with all the issues you've had.

 

[JayRolla]

Have you check for any damaged teeth on the timing gear sprocket on crank shaft?
I saw a video on youtube early today that is dealing with a non starting 4Runner with 5vzfe. Owner has taken it to 2 "mechanics" and they replaced fuel injectors, spark plugs, everything even an ECU. A well trained mechanic found out it is a damaged timing gear on crank shaft!

YouTube

No I have not but did see that video. That damage happened because a hose clamp fell into the gear and they started it but I might have to check just on case.

 

[gamefreakgc]

I think it's just flooded. New plugs, let it dry out a bit. I flooded mine once when I swapped the fuel return line and a similar sized vacuum line that fed into the intake. Smeeeellll that fuel! Although that time it had brand new Iridiums so it fired up fine once I stopped dumping fuel all over it.

How did you test you had spark anyway? Held the spark plug near the frame? Firing light?

If it were anything else, it'd start, sputter and die. It's not an air supply issue, something's wrong with either the fuel or the spark.

EDIT: did you clean the MAF before the no-crank or after it? Those tiny wires can be damaged and will prevent starting.

 

[APhelps]

No I have not but did see that video. That damage happened because a hose clamp fell into the gear and they started it but I might have to check just on case.

I've also seen a video where the gear had excessive slop and wouldn't function correctly. Perhaps pull the covers and turn the engine over and see if anything is loose/overly worn.

 

[19963.4lsr5]

EDIT: did you clean the MAF before the no-crank or after it? Those tiny wires can be damaged and will prevent starting.

My 97 won’t start if I don’t have air flowing through the MAF sensor. Just removing the rubber intake tube from the throttle body causes a no start.




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[AntleredRuin]

As mentioned above maybe failed fuel reg. Can raw fuel pass through the fpr vaccum hose because of a broken rubber diaphram?

It most definitely can. It'll start dumping fuel in the intake baffle/silencer and cause stalling and hard starts. In my experience, though, it was a hard start, not an impossible start. It'd crank for a few extra seconds then fire up, and then die If I didn't gas it immediately. Once on, it'd be ok If I didn't floor it. I never checked, but I assumed just super low pressure. So if the FPR is completely shot, that could be it.

[MENTION=50342]JayRolla[/MENTION] Do you smell gas coming from the FPR vacuum line, or if you remove the baffle/silencer, can you shake it and slosh gas around?

Ah or, do you have the ISR mod? If you do, and your FPR is leaking, it'd be a straight shot of fuel down the gullet of the throttle body (no baffle to run interference), and could be why your plugs are wet.

 

[Captsolo]

Use OEM fuel pump no AM. That's your issue.

 

[Bad Luck]

Use OEM fuel pump no AM. That's your issue.

Why do you think that's his problem?

 

[nissanh]

fuel pump

Why do you think that's his problem?

Non oem fuel pumps can have many defects: Low pressure, leaking, already dead, etc.,

I saw SouthMainAuto (Mr. Eric. O) showing a camry with a new (aftermarket) fuel pump installed by another shop didn't start or idle and dies. He replaced the aftermarket pump with used toyota pump and the car started running again.

There was another video of him showing the an ordinary fuel hose between the pump and mounting plate causing leaks. Regular fuel hoses cannot be submerged in gasoline. Must you the correct hose.

 

[AntleredRuin]

Overall, though, the Walbro *should* be good as it's a known and recommended replacement for the Denso for people with superchargers with fuel mods, if I'm not mistaken. Doesn't mean it can't be bad, but it's at least not an eBay Chinese Special

 

[19963.4lsr5]

This is 30 posts long and I skimmed. If you spray starting fluid in the PCV hole in the intake will it start?


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[APhelps]

People run Walbros all the time for aftermarket performance, so the idea that you need an OEM pump is a completely rubbish nonsensical "solution".

 

[Bad Luck]

Non oem fuel pumps can have many defects: Low pressure, leaking, already dead, etc.,

I saw SouthMainAuto (Mr. Eric. O) showing a camry with a new (aftermarket) fuel pump installed by another shop didn't start or idle and dies. He replaced the aftermarket pump with used toyota pump and the car started running again.

There was another video of him showing the an ordinary fuel hose between the pump and mounting plate causing leaks. Regular fuel hoses cannot be submerged in gasoline. Must you the correct hose.

Walbro is a known good brand. Considering his spark plugs are soaked in fuel I would assume the fuel pump is working just fine.

 

[AntleredRuin]

[MENTION=50342]JayRolla[/MENTION]
Was this ever figured out?

 

[JayRolla]

[MENTION=50342]JayRolla[/MENTION]
Was this ever figured out?

Not yet since life been busy. I was able to try few things. I pulled the new plug, let them dry out. Made sure motor was not flooded. Verified NO fuel through vacuum line on FPR. Verified fuel to the rail. Verified all plugs have spark. MAF seems fine, cleaned and sure it's not damaged but I've ran this car without a MAF before. Every car I've owned can run with no maf as it puts you in open loop.

Car wont start with starter fluid. Just turns, never a blip or chug like its trying to start. Just turns over and over.

Still need to verify fuel pressure but it get lots of fuel.

Need to check cam gear teeth.

Check ecu.

The one thing I did not do was drain and swap fuel. I mixed new with the old like I've done many times years on other motors. Fuel does not look tarnished but maybe its absorbed too much water to fire. But I was thinking if it was bad fuel.it would chug and be rough but not fire at all.

 

[LittleCaesar]

I have to ask how strong the spark is?

Anything else that needed attention before parking it?

Get that fuel pressure read.

 

[Middlefingergod]

I've got a similar issue on my 92 3.0 seems like no fuel to the spark plugs. When I pull them there bone dry. I've replaced the fuel pump the fuel filter open circut relay AFM and efi relay. I'm lost at this point

 

[brillo_76]

I've got a similar issue on my 92 3.0 seems like no fuel to the spark plugs. When I pull them there bone dry. I've replaced the fuel pump the fuel filter open circut relay AFM and efi relay. I'm lost at this point

Do you injectors have power? Fuel pressure in spec at the rail with the FSM? I am not familiar with the 2nd gens. May have better luck with 2nd gen users. As this is the 3rd gen section.

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[plcfcng]

if you pulled the plugs and they were wet where they fuel wet or coolant wet did you smell them. If they were fuel wet than I would check for spark like stated above. To check spark pull a plug wire put a screw driver in the plug wire hold the handle and put the metal part 1/4 from some metal like the alternator bracket and have some one turn the engine over you should get a steady spark every 3 to 5 seconds if you do not if it were me i would look at your timing belt.

:shrug:

 

[19963.4lsr5]

If you keep trying and the plugs keep getting fuel soaked the will foul and you will need new plugs even if there is spark.

The spark should be blue at 1/4” if it’s orange replace to coil or check your battery post voltage while you are trying to start it.

And as mentioned before check timing.


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