Hello guys. Just signed up since I have heard great things about you guys over here. I have a head scratcher and my previous forum is more geared toward newer Mustangs and didn't have the experience you folks do - I hope you guys can help. This could be multiple issues, or one issue causing a couple symptoms.
I bought my car very, very stock (true 92,xxx miles - hasn't rolled over). I have done a lot lately and developed an issue. I will try to keep this shorter than a novel yet give all the details.
I installed a BBK Catted H Pipe and it rattled, but I kept it on and it drove fine (this becomes important later). Everything was great, but it rattled. Car drove great.
I installed the Edelbrock Intake Manifold and everything else intake wise was stock. The car ran great!
I got the AccuFab 70mm TB with the BBK CAI and I developed a stumbling issue. It would start to go, fall on it's face, then GLH about 3500rpm.
I then started to notice the smell of varnished gas (bad gas) and while cruising at near idle looking for a business (maybe 10 minutes) it refused to start. After 20 minutes it fired right up. Didn't happen again for a month.
I then ditched the BBK Catted H Pipe back for the stock H Pipe (almost to the reason I mention it).
The other folks suggested I get a fuel pressure regulator and bump the pressure to fix the stumble, so I did. It did help a tiny bit, but I saw that the fuel pressure wouldn't hold when the car was off (gauge went to zero immediately). So I bought a new Walbro 255lph pump and dropped the tank and put it in last week. The tank is clean and clear and the gas smells like the new gas it actually is. The bad gas / varnish smell is not bad gas in the tank - the gas is perfect.
I put it back together and the smell of bad gas (varnish) is still there when the car warms up and I am idling in traffic. Now it is officially a VERY bad / powerful smell, worse than before for sure.
I have heard that O2 sensors can maybe cause some of this and since the H Pipe has been pulled a couple times the mechanic could have damaged or contaminated them. Thoughts? I am waiting for the new ones to arrive in the mail now and will swap them this weekend.
The bump in fuel pressure since the new pump seems to really have helped - if not fixed the stumbling but I don't know. I hesitate to hammer the throttle until I know what is really going on, but it seems better. I am just afraid I am not fixing the real issue and masking it. I set the fuel pressure to 52psi with the vacuum disconnected - which seems really high. The injectors are stock 19# with new (oiled) o-rings when I did the intake manifold.
I have checked the Charcoal Canister and the hoses, they all seem fine - But I think the smell comes from near the Canister. The vacuum line going to under the upper intake is new and the others look good.
Sorry again for the long post guys, I just want all the facts here to "help you help me". I appreciate any and all help and thanks for having me here! If you need any more input please ask and I will do my best!
I bought my car very, very stock (true 92,xxx miles - hasn't rolled over). I have done a lot lately and developed an issue. I will try to keep this shorter than a novel yet give all the details.
I installed a BBK Catted H Pipe and it rattled, but I kept it on and it drove fine (this becomes important later). Everything was great, but it rattled. Car drove great.
I installed the Edelbrock Intake Manifold and everything else intake wise was stock. The car ran great!
I got the AccuFab 70mm TB with the BBK CAI and I developed a stumbling issue. It would start to go, fall on it's face, then GLH about 3500rpm.
I then started to notice the smell of varnished gas (bad gas) and while cruising at near idle looking for a business (maybe 10 minutes) it refused to start. After 20 minutes it fired right up. Didn't happen again for a month.
I then ditched the BBK Catted H Pipe back for the stock H Pipe (almost to the reason I mention it).
The other folks suggested I get a fuel pressure regulator and bump the pressure to fix the stumble, so I did. It did help a tiny bit, but I saw that the fuel pressure wouldn't hold when the car was off (gauge went to zero immediately). So I bought a new Walbro 255lph pump and dropped the tank and put it in last week. The tank is clean and clear and the gas smells like the new gas it actually is. The bad gas / varnish smell is not bad gas in the tank - the gas is perfect.
I put it back together and the smell of bad gas (varnish) is still there when the car warms up and I am idling in traffic. Now it is officially a VERY bad / powerful smell, worse than before for sure.
I have heard that O2 sensors can maybe cause some of this and since the H Pipe has been pulled a couple times the mechanic could have damaged or contaminated them. Thoughts? I am waiting for the new ones to arrive in the mail now and will swap them this weekend.
The bump in fuel pressure since the new pump seems to really have helped - if not fixed the stumbling but I don't know. I hesitate to hammer the throttle until I know what is really going on, but it seems better. I am just afraid I am not fixing the real issue and masking it. I set the fuel pressure to 52psi with the vacuum disconnected - which seems really high. The injectors are stock 19# with new (oiled) o-rings when I did the intake manifold.
I have checked the Charcoal Canister and the hoses, they all seem fine - But I think the smell comes from near the Canister. The vacuum line going to under the upper intake is new and the others look good.
Sorry again for the long post guys, I just want all the facts here to "help you help me". I appreciate any and all help and thanks for having me here! If you need any more input please ask and I will do my best!
