Air flow meter?

[jayzrocket]

I have an issue with the flow meter poping at throttle. could I have poor fuel or maybe dirty fuel filter? Here is what is going on. I found this ZXT in a mechanics lot last Oct. and hadn't been started or driven since '93. The main reason why I bought the car was it has almost no rust, even in the common areas. So when I got it to the house, for giggles I checked the fuel relays and fuses, showed to be good, so I replaced the fuel pump and plugs and she fired right off. Kewel! But I couldn't get it to go into gear with the clutch when it was running, so I pulled the T-5 out to inspect and the bellhousing looked as if it had held water about a 3rd the way up.

Got a new clutch kit and resurfaced the flywheel, while Im at it, the Z has 191k on the clock so might as well have the turbo rebuilt. So I did. the builder said that I should be safe to set it @ 10lbs. and no more than 12 to 15 without an intercooler. Got every thing back together, fluids are fresh and back in business. Without driving it, it would start and come on the gas decent but when I would drive it, it would go bout a block and try to run out of gas. so I replaced fuel pump, again and filter and FPR, except this one is adjustable. At first seemed to do a little better but kinda fell back into its illness. Well I said, lets pull the sending unit, I honestly don't know how this poor thing was even starting up. The unit was so badly rusted from the years of condinsation build up that I couldn't even see thru the pick up screen. The floats wouldn't even move. I replaced the tank and unit and now I can drive it. But I cannot seem to get her dialed in. I have the FPR set at 42lbs @ idle and even tho I don't have a timming light, Im shure the distributor is pretty close. Not so sure bout the throttle position switch. I did have a flat spot when you first touched the throttle, so I adjusted that till it was gone. And after reserching all of my questions and thoughts on this site I have concidered the "from flow meter to mass air sensor" upgrade. But until I get around to doing that how or what can I look for about the popping back thru the AFM. So that is why I ask, what are the "common" issues that could make this occur?

[woldson]

I will say it, WoW 21 posts and this was wonderfully stated!

 

Personally I do not have this answer for you, but with the depth of your question, I hope finer fellows will help:) cheers!

[VinhZXT]

You haven't search enough. These turbo cars are famous for doing this and the main cause is the ECU connectors not making good contacts. Open the kick panel and push on the middle connector while driving and see the problem is there or not. This is the main recent why every body converts it to MS. it's not the AFM. GL

[BleachZee]

I had similar popping problems and after swapping AFMs and checking ECU connections the actual problem was a boost leak.

 

I had put in new fuel injector o-ring seals. One of them had somehow fallen off when I installed the fuel rail and all six injectors into the manifold. I replaced it and the bucking went away.

 

Basically a very small boost leak can cause one cylinder to run rich or lean.

There are hoses all over that intake manifold. Check, replace, or eliminate them.

[Jared]

so many common items to check. vacuum leaks, corrosion in maf, tps, and injector connectors, clean the maf electronics, dirty fuel injectors.

[roger.svoboda]

since you spent all that money on the other stuff you might want to invest in a timing light they aren't that expensive.