1989 chevy astro van rough idle/runaway acceleration

have also replaced 2 bad vacuum lines and checked map sensor. have also replaced 2 bad vacuum lines and checked map sensor.

Pull the fuse on your cruise control and see if that helps. Smelling gas is BAD! Either way too rich or a leak. Check the lines,,and even the filler pipe. A hole can cause a vacuum leak that will affect the air /gas mix etc. You have more than one fix going on with this one. Pull the fuse on your cruise control and see if that helps. Smelling gas is BAD! Either way too rich or a leak. Check the lines,,and even the filler pipe. A hole can cause a vacuum leak that will affect the air /gas mix etc. You have more than one fix going on with this one.

dont see anyfuses on fuse panel for cruise control. would this be under the hood? didnt find any gas leaks-neighbor next door said because van was running so rich had a buildup of vapors in catalytic converter? have since retested map sensor and find readings erratic, but corresponding to engine misfires with vltg readings fluctuating from around 3 down to .7--dont know if it is supposed to do that but it only goes down when engine is missing. today when i was driving (have to get to work, I know I shouldnt drive)started to bog down and backfire thru throttle body sporradically. according to some posts ive read, this leans to timing. going to pull rotor button/cap and reinstall old ones (they were worn but still ok.) recheck plugs for gap and color. after that I'm lost guys. have been trying to check egr solenoid (got an egr light after installing new one-reset and hasnt returned) some of my readings seem shady but i must admit to not really being a 100% on testing instructions. so what do you think? ignition? or a sensor? dont see anyfuses on fuse panel for cruise control. would this be under the hood? didnt find any gas leaks-neighbor next door said because van was running so rich had a buildup of vapors in catalytic converter? have since retested map sensor and find readings erratic, but corresponding to engine misfires with vltg readings fluctuating from around 3 down to .7--dont know if it is supposed to do that but it only goes down when engine is missing. today when i was driving (have to get to work, I know I shouldnt drive)started to bog down and backfire thru throttle body sporradically. according to some posts ive read, this leans to timing. going to pull rotor button/cap and reinstall old ones (they were worn but still ok.) recheck plugs for gap and color. after that I'm lost guys. have been trying to check egr solenoid (got an egr light after installing new one-reset and hasnt returned) some of my readings seem shady but i must admit to not really being a 100% on testing instructions. so what do you think? ignition? or a sensor?

I think you are running way too rich on fuel for one thing and I would ignore the sensors because they are doing what they are designed to do,,,flag the problem. Yes the fuel is probably going through the cat and your O2 bank 2 sensor is flagging a rich mixture coming out the pipe. MAYBE a stuck fuel injector. I would definitely check out the injectors. A clogged air filter will also mess up the air /fuel mix. Put a mirror by the end of the tail pipe and see if moisture is building up on it when the vehicle is running. That could be unspent fuel. The only other thing I can think of is possibly a timing issue and maybe the timing chain has jumped a tooth or two and messed up your timeing,, which would result in ignition problems. I think you are running way too rich on fuel for one thing and I would ignore the sensors because they are doing what they are designed to do,,,flag the problem. Yes the fuel is probably going through the cat and your O2 bank 2 sensor is flagging a rich mixture coming out the pipe. MAYBE a stuck fuel injector. I would definitely check out the injectors. A clogged air filter will also mess up the air /fuel mix. Put a mirror by the end of the tail pipe and see if moisture is building up on it when the vehicle is running. That could be unspent fuel. The only other thing I can think of is possibly a timing issue and maybe the timing chain has jumped a tooth or two and messed up your timeing,, which would result in ignition problems.

MIght want to clean the Mass Air Flow that is on the air intake hose going to the throttle body. They are very sensative and you need a cleaner specifically for them sold at Advanced Auto Etc. When these get dirty they don't send the correct info to the computer about how much air is going to the throttle body. Not a hard job but be gentle on the inside part where the fine wires or screen is. MIght want to clean the Mass Air Flow that is on the air intake hose going to the throttle body. They are very sensative and you need a cleaner specifically for them sold at Advanced Auto Etc. When these get dirty they don't send the correct info to the computer about how much air is going to the throttle body. Not a hard job but be gentle on the inside part where the fine wires or screen is.

I know its been a few days (bad weather here) but have not been able to troubleshoot anymore because the serpentine belt popped off and upon closer inspection I found that two of the pwr steering bolts have sheared off and of course they are into the eng. block behind a bracket that wraps around the front of the eng. and would be a bear to pull. I would like to try easy outing these but am unsure how deep I can drill before going past broken bolt. Plus probly should clean area of all fluids etc. not an easy job. so whatdya think? chevy dealer here not much help, cant even find bolts on parts index for me to order and see length. plus would need to remove tie rods etc to have room to drill. (a lift would be nice right about now) any ideas aside from dealer to figure bolt depth? kind of hate to just guess--bad things happen that way. (at least to me). thinking of having it towed. sigh* could use some input. thanks! I know its been a few days (bad weather here) but have not been able to troubleshoot anymore because the serpentine belt popped off and upon closer inspection I found that two of the pwr steering bolts have sheared off and of course they are into the eng. block behind a bracket that wraps around the front of the eng. and would be a bear to pull. I would like to try easy outing these but am unsure how deep I can drill before going past broken bolt. Plus probly should clean area of all fluids etc. not an easy job. so whatdya think? chevy dealer here not much help, cant even find bolts on parts index for me to order and see length. plus would need to remove tie rods etc to have room to drill. (a lift would be nice right about now) any ideas aside from dealer to figure bolt depth? kind of hate to just guess--bad things happen that way. (at least to me). thinking of having it towed. sigh* could use some input. thanks!