sometimes when i first start the car itll bog down at the littlest throttle touches and make a popping noise if i hold the pedal i was thinking it was running lean? or maybe pump is on way out

also i think it has a slight vacuum leak, if that helps any

 

When you say "popping noise", do you mean back firing out of the exhaust?

 

intake

 

you should first check injectors to ensure that they are all good. after that check your valve lash.

 

Definitely lean. If it feels completely weak, it's likely the fuel pump or really clogged up filter. If it's only when the car is cold, check/replace the coolant temperature sensor (front of the intake manifold - the one for the ECU, not the gauge).

 

I am having the same problem ONLY when it is cold.
I already replaced the CTS.
I also replaced the fuel filter.
How do I check the injectors, are you talking about just using a VOM or auctually taking them out and having them tested?
Is there a way to tell the the fuel pump is going?? The only reason I dont think it is the fuel pump is b/c when it is warm it runs decent.

Heres my question and I dont mean to hijack your thread fire350tpi could the problem be my ECM?? I am currently getting codes like VSS and O2. I used to get MAF low and ESC mod but those went away.

I really need to know if the problem could be my ECM?

 

That's funny you should metion the VSS and O2 codes. I've been getting the same exact two codes with my O2 code indicating lean mixute witch is apparent when I look at my plugs. I've replaces the O2 sensor with no change. The ECM is still giving me the same two codes. Any suggestions?

 

An O2 sensor code is rarely a problem with the O2 sensor itself. It's usually something blocking the fuel, or dumping lots of extra fuel in.

 

It was cheap enough to replace to see if that was the problem. I replaced the fuel filter so there are no retrictions there. What else could cause fuel restrictions or perhaps maybe providing a false reading to the ECM which in turn is not controlling the fuel delivery acurately?

 

Fire350tpi, now I am wondering, are you getting any codes? If so which ones? Hopefully together we can solve this problem.
drewdiamond, is your car doing the same thing as described above?

 

I don't get a popping sound at the intake. However, I do notice that when the car is cold a get some kind of a popping sound when I rev the engine out the tail pipe. I'm wondering if the cat is gone? The exhaust is new from cat back. May be something non related. I also notice that when the car is cold and I accelerate quickly it's jerky, but after several minutes it's fine. The car runs good and fun to drive but the light comes on and the only codes are O2 lean and VSS. I may bring it to someone eventually.

 

I have a feeling that you are having the same problem, does it bog down when it is cold? And Hesitate COMPLETY when cold?? Thats what mine is doing.

My question to both, is you car hard to start up at first like mine??
Does it hesitate at all when it is warm? mine does ever so slightly, probably something that "normal" people wouldent notice but i do...I have a feeling that when I solve this that it will go away.

Oh and BTW drewdiamond, if you ever bring it to someone and they solve this mystery, please ask what was wrong just so we know. Thanks

 

hey guys, myns throws a code but i believe its intermintent, it doesnt show up in the ecm logs, myn bogs down when cold and pops to catch up, new tps, Reset iac,although i didnt replace fuel filter yet, fuel pump is good, know theres a vaccum leak ( myn stalls till its warm) wierd thing is, if i pop of intake boot to let the tb breath good, it runs like a champ instant response at any temp. but the maf is oviously getting false readings...so maybe my maf, i was thinking of just replacing the o2 sensor 2, but i believe there is something else causing the major problem

 

I not sure if I would call it a bog or a series of jerky hesitations. After about several minutes as the engine starts to warm is goes away. I don't really notice much after this but can't say for sure if it's completely gone. As far as start-ups, when the car is cold it may take two or three turns of the key but then fires right up and goes to a 1600 rpm cold idle. This is my first carburated engine and am thinking of going back to TPI. I bought the car because it was in fantastic condition, 70k miles, 5 speed and T-tops. Everything I was looking for except for the TPI. I found a couple of TPI IROC's with low mileage but the prices are rediculous. This car was a nice find. I'm going to try and drop it off this week at a local garage. The sons owner is a third gen guy but prefers mostly the TPI vs carb. I'll give him a few hours to see what he thinks and I'll let you know. In the meantime, I would appreciate any suggstions from other members.

 

Wow, you shocked me that your car wasnt TPI, b/c this is a TPI board. This could be a good thing though? That means for us it might not be TPI related. Not sure but like someone else said it could be the Fuel Pump.

 

I'm sure it could be one of several things. That's the problem, it's never straight forward and someone always has a different idea. I'll keep you posted.