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GVR-4 Stutters and stalls on uphill left turns

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mk2davis

Proven Member
35
1
Dec 7, 2018
NEWBURY PARK, California
The car runs great cruising around, on the freeway, and in the canyons ... most of the time.

On uphill lefts in the canyons, it stutters, idles but won't rev, and then sometimes stalls. If I turn the car off, wait 7-10 seconds, and then turn it on then everything is good again. It feels like a fuel issue to me, almost like the bowl is running low on a carbed vehicle.

My first guess was fuel pressure regulator, but from what I've read, if that was the issue I'd more than likely run too rich. Is there a fuel pickup in the tank that might have issues? Fuel pump maybe?

All this happened with more than a half tank of gas. It's a new build (mostly stock, 16g) with less than 100 miles on it. Before this, it sat for a few years.
 
Possibly trash in the gas tank getting up against the fuel pump sock and starving it of fuel, or even water in the tank doing the same.
 
Not sure if GVR4s have the same tub in the tank, but on a 2G, there's a small 'tub' within the tank where the pump sits inside of. It's there to reduce excess splash hitting the pump, but also retaining enough fuel quantity to keep the pump fed at all times, even during hard cornering.

I've heard people having issue with that tub missing, giving similar effects.
 
I don't know if it'll do it with a full tank, but the first time it had 3/4 of a tank, the second about 2/3. Being a new build, I'm trying to keep boost down below 5 pounds. That said, it's only done this after being on boost for 45- 60 seconds going up hill in canyons. I haven't gotten the result in a parking lot, but I haven't tried either. I have taken some flat sweepers to the left successfully, but those did not have boost before hand.

As far as the "tub" goes, the car has been in the family since new and this behavior is a recent development. I don't think this is the culprit. I'm guessing it's crap in the tank surrounding the sock, or a questionable pump and or wiring. Either way, it looks like I'm opening the tank to look at the sock, and since I'm in there I'll throw in a Walbro 190 and rewire. I'll also take a look and see if it has a tub, if for no other reason than to answer the question.
 
I installed a new stock FPR, which did nothing to address the problem. Not a surprise, but wanted to rule it out.

I did get the problem to repeat on a flat corner at a left turn light. Flat approach, 5ish pounds, downshifted for a quicker left, accelerated out of the apex, and it seems to be around 0psi (so the turbo is starting to spool) that I get the STUTTER. I laid off the gas for 4ish seconds, and everything was normal.

Next left a block later and a similar thing happened, although it took a lot longer for full power to come back. I think this is because the exit was on an uphill, so I was building boost and using gas at a quicker rate.

If anyone has ideas, I'm all eyes.
 
I am NOT logging. I've looked around, and it looks to be unavailable right now?

This issue on a stock car is fairly significant.... I wouldn't imagine it will be hard to diagnose. Maybe I'm being optimistic.

I think your first post is going to be close to the mark. Crap in the tank, something with the sock, ailing fuel pump. The filler neck got a hole while the car was sitting, and all the fuel slowly trickled out. Maybe the ethanol gummed up the sock or something. The FP is ordered.

Thank you all for checking in. If you have something else for me to check, please mention it. I'd hate to spend money and time on something that is not the issue.
 
FINALLY got my Walbro pump and kit, so I pulled my old unit out. At first look, everything looks to be okay; the sock was a little dirty, the bottom of the tank looked clean, the steel fuel line didn't seem to have any cracks in it, and the tub looks to be in place. So at this point it's looking like a rewire and the new pump will fix my ills.

And then I dropped my new pump. The feed nipple broke off, which is obviously frustrating. So another few days for shipping. Which is right when rain is coming for four days. Another week...
 
While I was finishing up my wiring this morning, I did find that the ground was loose. No doubt, this is part of my issue if not all of it. The ground is on the rear wall of the trunk close to the trunk latch. It's always the simple things...
 
I got another Walbro fuel pump (this one I didn't spike on the ground), upgraded the wiring with 10 gauge and a relay, and remounted the ground. Things seem to be flawless right now, but I don't know which of the three was the culprit. I want to reinforce the ground in the future for reliability, but as far as functionality goes everything is golden.

I want to thank everyone for their help. A couple hundred more miles of break in, and then I'm off to smog!
 
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