need help lt1 boltons-cam problems!
Thread Starter
On The Tree
Joined: Feb 2009
Posts: 137
Likes: 0
From: chicago
need help lt1 boltons-cam problems! full bolt ons, thunder racing 230/236-112lsa. the car ran like ****, i change plugs, wires, lots of sensors, radiator,t-stat, header gaskets, put stock balancer back on no more underdrive. the car ran very good after all that, it didnt break up or rpms hang up anymore. after about am hour of driving rhe problems came back but not as bad. any info? its got pcm4less tuned for the cam
Explain "ran like ****." You need to be more detailed. Is it when the car is warmed up? All the time? Certain RPMs? More info please.
Perhaps your ICM is bad. Once they get hot, they tend to fail, as do most electrical components. Have you changed that?
Perhaps your ICM is bad. Once they get hot, they tend to fail, as do most electrical components. Have you changed that?
+1. Need much more info, like "lots of sensors", that could mean anything.
Thread Starter
On The Tree
Joined: Feb 2009
Posts: 137
Likes: 0
From: chicago
sorry, i changed-both temps-tps-iac-map-iat. the car runs good untill about 3 grand. if you pull in any gear around 3 grand it breakes up-sputters, i dont know how to exsplain.
i changed the plugs, wires, header geskets, t-stat, radiator, balancer. i drove it for a while and it was fine now all problems are back, rmps hang up around 2grand when stoped, if you give it a lil gas it will come down to about 900 and jump from 500-900 and almost die. it hesitates bad when you get on it likes it missing. its hard to start after hot, cranks and you have to give it gas..
i changed the plugs, wires, header geskets, t-stat, radiator, balancer. i drove it for a while and it was fine now all problems are back, rmps hang up around 2grand when stoped, if you give it a lil gas it will come down to about 900 and jump from 500-900 and almost die. it hesitates bad when you get on it likes it missing. its hard to start after hot, cranks and you have to give it gas..
Sounds like you replaced everything except the ICM (ignition control module). Like I mentioned, they are prone to heat-soak.
Also, if it hesitates to reach higher RPMs, might want to take a look and make sure your cats (if you have any) are clogged.
Also, if it hesitates to reach higher RPMs, might want to take a look and make sure your cats (if you have any) are clogged.
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I'm going to guess that you have a 97...10474610 is the GM part number. Don't settle for anything less than the Delco. Additionally, you will want to move the ICM farther away from the cylinder head, as that is the hottest part of the engine. Do a search and you'll find some information.
IMO, stick with the OEM optispark. The opinion is split on the MSD. Some people have problems with them while others have success. I am sticking with the OEM.
IMO, stick with the OEM optispark. The opinion is split on the MSD. Some people have problems with them while others have success. I am sticking with the OEM.
From what you have explained thus far, the ICM is what you should target first - not the optispark. It's relatively inexpensive. It's easier to diagnose a failing optispark if you know that the ICM is good.