(Update: fixed) 97 Bonneville 3.8L stalling - was crank sens
Resolution; I was desperate to get this fixed since I was under pressure to do something. The three leading possible causes were battery cable corrosion, crank sensor, or PCM. There was some corrosion on a battery cable (which has now been cleaned up) but I'm dismissing this as a cause since the stalling predated the last battery replacement/service in the fall. I used a hair dryer on the PCM to see if heat would cause the stall. It didn't (though maybe I needed more heat), so I went ahead and had the crank sensor replaced. It had been stalling several times a day (and getting worse) and now has gone three days with no stalling, so is apparently fixed. Thanks guys!
Hello - My daughters 97 Bonneville has 120k miles and since we bought it used last summer it has stalled occasionally with no codes - but more frequently lately. It might stall several times in a week, or go weeks in-between. I replaced plugs and wires to get rid of an ignition code, and while it runs great it still stalls. After replacing the fuel filter it went two months (over the winter) without stalling, but not sure if it was luck, the temperature, or the filter. IWhen it first started occurring, she could start it right back up but now it just cranks and won't restart for about 5 minutes. Someone suggested the catalytic converter but an exhaust guy told me that it would be throwing a code and would not have much power. She has commented that sometimes when it starts to die, she can hit the gas and keep it going. It did stumble once for me on the interstate but never died. I really need to get this addressed as it is a safety concern - stalling in traffic. So - what can cause warm stalling, throws no codes, and has to sit for five minutes before restarting? I searched the forums and there are a lot of ideas, but all seem to throw codes. What should I check/replace first? Thanks!