I'll start with saying that I don't post a lot on here since I can usually solve my problems simply by browsing the forums.
Problem is with a 4.3GL PLK model with the SX Cobra drive. Trying to track down my bogging issue. I am a mechanic, very particular about my work and absolutely hate just throwing parts at engines without diagnosing things first. Bought the boat as a salvage due to overheating, installed new heads, reassembled engine and ran it on a test stand. Ran good until the accelerator pump stopped squirting.Found the accelerator pump was full of rust that was plugging the passage to the squirter. Rebuilt the Holley 2bbl and dropped the engine in the boat. Starts up excellent, set the timing on the Delco est distributor and and everything seemed ok....until i started playing with the throttle. It hesitates (bogs) with fast action of the throttle with no backfire, acting as if the accelerator pump is not working. Seems to be spraying a good stream of gas into the carb, but I decided to pull it back apart in case there may still be some crud in the passages. Cleaned it extra good again and even replaced the check valve and diaphragm as they are inexpensive and I had some extras. Put everything back together....same thing...starts right up, idles great and even revs nicely if you ease on the throttle, but as soon as you give it fast throttle it bogs! I checked, double checked and triple checked the timing and noticed when i take the B+ jumper wire off the timing jumps to about 20 degrees and stays right around that setting all throughout the rpm range. I am not super with the Delco est advance curve, but could possibly a faulty advance system on my distributor be causing my hesitation/bogging?? Anybody who has some input on this issue would be extremely helpful.
Thanks in advance, Doug
Problem is with a 4.3GL PLK model with the SX Cobra drive. Trying to track down my bogging issue. I am a mechanic, very particular about my work and absolutely hate just throwing parts at engines without diagnosing things first. Bought the boat as a salvage due to overheating, installed new heads, reassembled engine and ran it on a test stand. Ran good until the accelerator pump stopped squirting.Found the accelerator pump was full of rust that was plugging the passage to the squirter. Rebuilt the Holley 2bbl and dropped the engine in the boat. Starts up excellent, set the timing on the Delco est distributor and and everything seemed ok....until i started playing with the throttle. It hesitates (bogs) with fast action of the throttle with no backfire, acting as if the accelerator pump is not working. Seems to be spraying a good stream of gas into the carb, but I decided to pull it back apart in case there may still be some crud in the passages. Cleaned it extra good again and even replaced the check valve and diaphragm as they are inexpensive and I had some extras. Put everything back together....same thing...starts right up, idles great and even revs nicely if you ease on the throttle, but as soon as you give it fast throttle it bogs! I checked, double checked and triple checked the timing and noticed when i take the B+ jumper wire off the timing jumps to about 20 degrees and stays right around that setting all throughout the rpm range. I am not super with the Delco est advance curve, but could possibly a faulty advance system on my distributor be causing my hesitation/bogging?? Anybody who has some input on this issue would be extremely helpful.
Thanks in advance, Doug