AboutRobert Summers Expertise domestic auto/truck repair, auto body, painting. I currently own a large auto/truck/marine repair shop. 40 years certified 310S,310T,310B in ontario Canada
Experience 40 years certified 310S,310T,310B ontario qualified, 7 years with GM have owned my own shop now for the past 27 years.was automotive marketing director for large auto parts supplier.
Organizations CFIB (current) past member AARO and APAA.
Education/Credentials grade 12 plus 2 years college. many aftermarket training courses
Question Hi
I have a 87 S10 2.8 liter TBI, auto. It has always ran like a champ! Until it suddenly started sputtering. It will turn over, but all it will do is sometimes idle harshly but with no MIL light. I have found that if I unplug the Temp sensor, it will crank and run smoothly (at a high idle) for about 15 seconds. During this time I can rev the engine, but as soon as those 15 seconds are gone, it dies. Then it's back to a really rough idle, and if I floor the gas. it will die. I replaced the temp sensor. I did notice that if I disconnect the map sensor's vacuum line it idles better, but dies once again once I touch the gas. One more thing, no MIL light at all till I start unplugging sensor. Can you give me an idea?
Answer Hi Brian. well it could be a heat sink problem in the ign control module. try changing it, and the other thing it could be is a bad coil. even though you don't have a service engine soon light try putting a scan tool on it and see if you have any history codes...also watch the voltage on map sensor, high voltage would mean bad ign module.... hope this helps
