Muncher Posted Saturday at 11:50 PM Share Posted Saturday at 11:50 PM Brand new dizzy, iac, tps, map sensor/cruiser map sensor mod and c101c delete andddd its still stuttering. It does seem the new map sensor made it worse so I'm gonna throw the old one back in tommrow. No clue what could be really causing this anyone have any ideas? and what i mean by stuttering is it will be driving along and suddenly loose alot of power kinda feel like miss firing then suddenly gain it back still drives fine and does not brake down or anything but I hate driving it like that. Could the cps cause this? Its basically the only sensors I haven't changed Link to comment Share on other sites More sharing options...
ghetdjc320 Posted Sunday at 01:26 AM Share Posted Sunday at 01:26 AM Sounds like CPS though I’d throw fuel pump/filter in the mix. Might be worth checking your major ground connection as well if you haven’t already, but specially the engine block and the fuel pump ground behind the left tail light. Link to comment Share on other sites More sharing options...
Muncher Posted Sunday at 02:01 AM Author Share Posted Sunday at 02:01 AM 33 minutes ago, ghetdjc320 said: Sounds like CPS though I’d throw fuel pump/filter in the mix. Might be worth checking your major ground connection as well if you haven’t already, but specially the engine block and the fuel pump ground behind the left tail light. Going to check fuel pump ground tommroe all though i think I fixed it when I put new taillights in. The drivers fender ground and engine block ground were done today. Link to comment Share on other sites More sharing options...
hgeranium Posted Sunday at 02:16 AM Share Posted Sunday at 02:16 AM 2 hours ago, Muncher said: Brand new dizzy, iac, tps, map sensor/cruiser map sensor mod and c101c delete andddd its still stuttering. It does seem the new map sensor made it worse so I'm gonna throw the old one back in tommrow. No clue what could be really causing this anyone have any ideas? and what i mean by stuttering is it will be driving along and suddenly loose alot of power kinda feel like miss firing then suddenly gain it back still drives fine and does not brake down or anything but I hate driving it like that. Could the cps cause this? Its basically the only sensors I haven't changed I was having an issue like this in 2022. It would stumble over itself sometimes during acceleration but would never fully stall. YMMV but for me it ended up being a mix of the fuel pressure regulator, vacuum leaks, and possibly the CPS. But mostly the FPR Link to comment Share on other sites More sharing options...
Muncher Posted Sunday at 02:20 AM Author Share Posted Sunday at 02:20 AM 3 minutes ago, hgeranium said: I was having an issue like this in 2022. It would stumble over itself sometimes during acceleration but would never fully stall. YMMV but for me it ended up being a mix of the fuel pressure regulator, vacuum leaks, and possibly the CPS. But mostly the FPR What did you replace the fuel pressure regulator with? Its part of the rail kinds isn't it Link to comment Share on other sites More sharing options...
hgeranium Posted Sunday at 02:20 AM Share Posted Sunday at 02:20 AM Just now, Muncher said: What did you replace the fuel pressure regulator with? Its part of the rail kinds isn't it It goes into the fuel rail but it is its own separate part that you can replace. Link to comment Share on other sites More sharing options...
hgeranium Posted Sunday at 02:22 AM Share Posted Sunday at 02:22 AM 1 minute ago, Muncher said: What did you replace the fuel pressure regulator with? Its part of the rail kinds isn't it Standard Ignition PR21 is ~$58 on RockAuto. I would do some research first before replacing this since it is relatively expensive. Link to comment Share on other sites More sharing options...
Ωhm Posted Sunday at 03:02 AM Share Posted Sunday at 03:02 AM 3 hours ago, Muncher said: Brand new dizzy Did you do Distributor Indexing? Link to comment Share on other sites More sharing options...
Muncher Posted Sunday at 03:13 AM Author Share Posted Sunday at 03:13 AM 11 minutes ago, Ωhm said: Did you do Distributor Indexing? Yes I did. Link to comment Share on other sites More sharing options...
Ωhm Posted Sunday at 02:05 PM Share Posted Sunday at 02:05 PM The reason I asked is symptom sounds like/could be crossfire in distributor cap. Link to comment Share on other sites More sharing options...
Muncher Posted Sunday at 06:58 PM Author Share Posted Sunday at 06:58 PM 4 hours ago, Ωhm said: The reason I asked is symptom sounds like/could be crossfire in distributor cap. What causes cross fire? Link to comment Share on other sites More sharing options...
Ωhm Posted Sunday at 07:37 PM Share Posted Sunday at 07:37 PM 32 minutes ago, Muncher said: What causes cross fire? When the tip of the rotor and the tower terminal (cap) are not lined up properly (indexing), sometimes caused by dropping in the Distributor one tooth off. At higher RPM’s when vehicle is calling for MAX advance (timing), rotor will crossfire to the wrong tower terminal. Carbon build up in the Distributor Cap can also cause crossfire. Link to comment Share on other sites More sharing options...
Muncher Posted Sunday at 08:02 PM Author Share Posted Sunday at 08:02 PM 24 minutes ago, Ωhm said: When the tip of the rotor and the tower terminal (cap) are not lined up properly (indexing), sometimes caused by dropping in the Distributor one tooth off. At higher RPM’s when vehicle is calling for MAX advance (timing), rotor will crossfire to the wrong tower terminal. Carbon build up in the Distributor Cap can also cause crossfire. Ah ok it did thus before changing the distributor as well but I cut the old cap so I could see the rotor it was definitely at number one when I locked it downm Link to comment Share on other sites More sharing options...
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