GMC SONOMA ENGINE PROBLEM
1999 GMC Sonoma • 111,000 miles
'99 Sonoma with 4.6 V6 engine, automatic transmission. This morning, cold start (20F), engine died twice immediately after starting. Feathering throttle kept it running until warm, then no apparent problems. Returning home tonight it started fine, then I noticed it was starting to cut out at higher rpm as transmission was about shift. Got to a side street with a slight uphill grade, shifted down to 2nd, and drove the grade under medium acceleration produced considerable cutting out, almost sounded like backfires in the exhaust but felt more like fuel or air starvation. There are no codes showing. I noticed a sulfurous smell in the exhaust upon parking. Intake manifold gasket was replaced about 2,000 miles ago, engine has run fine since then. This work included a new rotor and cap, but I noticed it was not as immediate to start as before the work. I suspect a sensor of some kind, perhaps collant temperature, or fuel pressure? Last fuel fill was about 100 miles before this happened, so I do not suspect bad gas as much as I would if this had happened immediately after a fill-up. I use 10% ethanol blend unleaded gas.
December 12, 2012.
December 12, 2012.
Check out the related content below while we wait for the question to be answered by a professional mechanic.
1986 Nissan Stanza, California version. The engine wants to die when stopping. I thought that the lock-up switch for the torque converter was not unlocking. I have installed a used ...
2 answers • 1986 Nissan Sunny • 100,000 miles
1999 Hyundai Elantra mileage: 110,000. This car idles fairly well in neutral or park but very rough in reverse and drive. I just replaced the engine with a used engine and it is doing ...
1 answer • 1999 Hyundai Elantra • 110,000 miles
1988 Chevrolet Astro Van mileage: 247,000. It's time to replace the engine in my 1988 Astro. I bought a 4.3 V6 that has come out of a 1991 S-10. When I dismantled it to get it ready to ...
1 answer • 1988 Chevrolet Astro • 247,000 miles
1990 Toyota Camry mileage: 150,000. 1. The oil warning light is on. 2. There are four quarts of oil in the car. 3. The oil filter is dry. 4. The engine sounds rough. 5. There is noise ...
3 answers • 1990 Toyota Camry • 150,000 miles