engine missing at 1/4 throttle???

[birel21y]

Well I'm trying to figure this out. Just recently my car has been missing only at around 1/4 throttle. This will not hapeen at idle or wot. What gives? :dontknow:

 

[switch96]

Do you have new plug wires? Looks like it from your avatar.

 

[birel21y]

Yep new wires, plugs, etc. Also whats weird, is my base timing keeps on moving. My dizzy is tight, yet i keep having to adjust it. I dont believe this to be the problem, however. its a slight miss only when im at 1/4 to 1/2 throttle. It goes away with wide open throttle.

 

[CC'S95GT]

you might have gotten a cracked plug. but I have no idea how idea to figure out which one is bad

 

[2slo95fiveoh]

Have you ever changed your timing chain? On my 95' stock engine, I had the same timing problem.. I would set the timing, tighten down the dizzy,
then fire the car back up and the timing would jump back 2-4 degrees.. When i took the engine out of the car I pulled the timing cover off, and
the timing chain was pretty sloppy.. It might be time for a new one.

 

[birel21y]

Have you ever changed your timing chain? On my 95' stock engine, I had the same timing problem.. I would set the timing, tighten down the dizzy,
then fire the car back up and the timing would jump back 2-4 degrees.. When i took the engine out of the car I pulled the timing cover off, and
the timing chain was pretty sloppy.. It might be time for a new one.

Hmm.. Possibly. But i have a new adjustable billet timing chain. I might just be crazy, and i have not tightened it down good enough

 

[Lee12609]

your checking it with the spout out right???

 

[blkpitbull]

thats what I was about to ask!!

 

[toyman]

Or the balancer is going south ( that may explain the reading fluctuations). A cracked plug or a wire not firmly attached may account for the miss.

 

[P51CrazyHorse]

Possibly a bad TPS sensor? Might have a "dead spot" that's causing an issue when operating the throttle.

 

[birel21y]

Possibly a bad TPS sensor? Might have a "dead spot" that's causing an issue when operating the throttle.

I think i fixed this last night. Swapped out my 75mm TB for the stock one. It was just the TPS sensor. Runs fine!

75mm BBK TB now for sale.

 

[P51CrazyHorse]

Glad you found it. Couldn't you just put the TPS from your stock TB onto the 75mm one, though?

 

[birel21y]

Id rather run the stock TB and know its running good. Im done messing with that stupid thing.

 

[P51CrazyHorse]

Understandable. I've felt that way about some of the things I've had over the years.