scoryell21 10 Report post Posted February 25, 2014 I have just finished restoring a 1969 GT 428CJ and took it out for its first big road trip this past weekend. I had ran it up and down the highway before the trip a few times the and had over 100 miles on it and everything seemed fine, I put over 200 miles on it on this trip and I started to notice a bog right during acceleration in any gear. Most noticeably from a stop, it almost dies going through an intersection but then picks up and runs fine. Even at 70mph and in 4th gear if I let off the gas and get back on it quickly the bog is there but not so much if I roll through the acceleration. I did not notice this when first running it in the days prior but after getting on it and really running it for a day it showed up. I have checked the vacuum lines and all seems well. I have read some information that it could be the accelerator pump or even the squirters? Any thoughts or information would be great. Quote Share this post Link to post Share on other sites
Brian Conway 279 Report post Posted February 25, 2014 Start with the easy stuff. My timing is set at 14 degrees and actual is 34. Pull a couple plugs to see how they look. Check your fuel mixture screws. If you think it is the carb. see about borrowing one and switch it. Hey the car is running and you just need to dial it in. You'll get it. Brian Quote Share this post Link to post Share on other sites
scoryell21 10 Report post Posted February 25, 2014 Thanks for the reply. I will check those things tomorrow. Quote Share this post Link to post Share on other sites
9RO1M 12 Report post Posted February 25, 2014 If it has points check the gap as well. Quote Share this post Link to post Share on other sites
Rcodenewf 44 Report post Posted February 25, 2014 Do you have the factory carb on there? Quote Share this post Link to post Share on other sites
scoryell21 10 Report post Posted February 25, 2014 I do have points but I have ordered the petronix ignition to eliminate points. The carb is not the original that came on the car someone installed it after but it is close to the original I cant recall the number off hand but it is a Holley Quote Share this post Link to post Share on other sites
Rcodenewf 44 Report post Posted February 26, 2014 Is the carb fresh? Sounds like an accelerator pump issue to me. With engine off, look down the throat of the carb while opening the throttle . You should see two steady streams of fuel in each of the primary venturi. If not you have a problem. You may have a ruptured/torn accelerator pump gasket. Any signs of fuel weeping at the front of the carb? John Quote Share this post Link to post Share on other sites
Raven R code 281 Report post Posted February 27, 2014 I had similar problems with my CJ. A combination of two things were discovered. 1. The fuel line from the pump to carb had an inline glass bulb fuel filter. The car ran fine with it before the rebuild but after, it caused stalling problems. Removed the inline filter solved the problem. Even though I removed the filter it was still causing vapor lock. 2. The second performance issue occurred from a fuel pump issue. I finally tore it down to find the diaphram had dry rotted along one part of the outer edge. Hope this helps Quote Share this post Link to post Share on other sites
scoryell21 10 Report post Posted February 27, 2014 Thank you for the help everyone. I found and fixed the problem! The previous owner had done some modifications and it has a '70 spacer plate with a 1/2 hose coming from the PCV valve into the spacer plate, the plastic nipple on the spacer plate was broken, I fixed that and took it down the road and the problem seems to have gone away. Quote Share this post Link to post Share on other sites
Brian Conway 279 Report post Posted February 27, 2014 Good for you. Really like hearing a story with a simply fix and happy ending. Brian Quote Share this post Link to post Share on other sites
