I recirculated the BOV, installed and set the FPR, and it still hesitaties?

[Novablue454]

As some of you know my car is having serious hesitation issues. If anyone on here has driven a carb'd V8 on a very hot summer day, you know how they vaporlock and studder around 2500 to 3500? Thats what mine is doing. Everyone said recirculate the BOV, so I did, and I also installed an Aeromotive FPR and set the idle pressure to 40psi. Its not doing it near as bad as it was originally, but its stull studdering out between 3000 and 4500 rpm.

I have a boost like coming from the BISS (i think thats what its called), and a vacumn tee below the thermostat housing. Neither of them are large, i had to use soapy water to find them. I dont think they are big enough to be causing this.

Does anyone have any other ideas?

 

[GVR4592]

It sounds like you set the fuel pressure incorrectly. Remove the vacuum/boost reference line from the regulator and set it to 37 psi. Then reconnect the line and you are done.

 

[Novablue454]

Thats how I did it.

 

[GVR4592]

So is it 40 or 37? What is the fuel pressure at idle with the vacuum line connected?

 

[Novablue454]

im not sure exactly. my guage goes 20-40-60-80. so its a little bit below the 40 mark with the vacumn line disconnected.

I think i might have found a major contributer to my problem. I didnt replace the lower injector to manifold seals, and one of the injectors had a very large leak. The only problem is, I cant find them anywhere.

 

[talon210]

I had a studdering problem and I just had very bad and incorrectly gapped plugs, now your problem may be more serious but thats what was wrong with my car.

 

[Novablue454]

i just put in some NGKs about a week ago. The gap was right.

 

[oldman]

im not sure exactly. my guage goes 20-40-60-80. so its a little bit below the 40 mark with the vacumn line disconnected.

Then go make sure and report back. Everyone uses the same gauge, if we can do it so can you.

I think i might have found a major contributer to my problem. I didnt replace the lower injector to manifold seals, and one of the injectors had a very large leak. The only problem is, I cant find them anywhere.

Any sponsor vendors that sells injectors will carry them.

i just put in some NGKs about a week ago. The gap was right.

After all that you gone through in the other thread, you're being rather slappy here. Which NGK and what gap size?

 

[Novablue454]

NGK BPR6ES gapped at .027 I believe. I went off the spark plug thread in the tech forum. And I double checked the fuel pressure, It was at 43psi, lowered it down to 37psi. At the same time i replaced the Hallman MBC that was installed on my car with the homemade MBC that I had on it previously. At 10psi, it drives fine with no issues. But my homemade one wont go up any higher now. Berfore the shop touched it it set at 15psi without any problem. When I got back into the garage and popped the hood, I noticed a loud hissing sound, and thats how I discovered the injector whatever its called is bad. Id rather not order them online and have to wait a week to get them, so im going to try and track some down at work tomorrow.

 

[90TTalonAWD]

it sounds like your hesitation problem is boost leak related. Get a boost leak tester and check everything out. If you want to get some of those seals for you injectors, machv.com has them

http://machv.com/inorset1.html

 

[deletrius]

Definitely sounds like a boost leak, get that injector fixed and report back.

 

[Novablue454]

Problem Solved. It was a combination of a bad alternator, bad plug wires, and I replaced the seals with the Home Depot version.