Ok guys. My car has been running "decent" for sometime. If I jump on it from a stop it almost dies and goes nowhere fast. But does decent on the highway. But overall it was getting me from A to B which is all that really matters. But here comes the bad part. Last night I went to the car wash as usual. And as routine I put a bag over my MAF and distributor and cleaned off my engine with a high pressure hose, as usual. Jumped in the car and it wouldn't start. Would turn over, but no starting. So I disconnected my battery to clear my ecm and waited about 10 minutes then it started but hesitated EXTREMELY bad at low mph but did OK on the highway. This morning I went to run up to the recruiters office and it ran the worst I have ever seen. The car literally could not do over 30mph. Even with my foot to the floor it would DUMP black smoke, and I mean a insane amount. But go nowhere. The rpms would jump up but be bouncy and sound like bad misfire. And I used 1/2 a tank in about 20 miles. I disconnected the battery and it mad no difference. Even starting without the MAF made no difference. I am completely lost. My MAF is a old bosh unit which I was told was bad and has always kept the SES light on but the car still ran and drove "decent". The coolant temp sensor is also about a year old, but maybe the high pressure hose screwed it up? Or maybe the TPS got screwed up from the water? Also the o2 is sort of new. If anyone has any input it would be greatly appreciated. This car is my DD so I need it fixed as soon as possible!

 

Ok, now you know not to use high pressure hose in the engine bay.
No way for us to know what you did from that scenario.
Start by looking for disconnected plugs. Check all the fuses. Try and dry out the engine compartment by sitting in the sunny dry air, or maybe use a fan and heated garage. Find out what codes the computer is displaying.
If you're lucky, whatever's wet will dry out and back to where you were. If not, you broke something and you will need some more diagnosis to find out what.

 

I just pulled the codes. There was a code 43 and 45.

 

code 43 is the electronic spark control. its above the brake booster near your relays. and code 45 is rich exhaust indication.un plug the ESC and clean the contacts, it may fix it.or you may need a new one .you say the MAF has been giving you problems?? resist the temptation to get a cheap re-man one.yes NEW ones are pricy ,but worth every penny.do this ,air filters? (MAF cars don't play well with K&N) MAF sensor? clean throttle body? TPS dead/out of adjustment? a tune up? these things will probably go a long long way twards fixing your problem. not too expensive if you do all the work yourself.one other thing,buy yourself a factory service manual.they answer questions like no other. NOT a Haynes or chiltons

 

I put on a new cap and rotor and a coil wire and still no difference. How do you adjust the tps

 

It now has no trouble codes. So something definitely happened

 

the CEL bulb burned out?? just joking!! anyway some of the later years ,the TPS isn't adjustable.you just bolt it on and go. but if yours has elongated slots for the mounting bolts.it adjusts for .5V at idle or with the engine off key on.and it should show 5V at wide open .IF yours is adjustable.the easiest way to adjust it is use a DVOM

 

I unplugged the MAF and started it and it made a big difference

 

that alone tells you that you have a bad MAF. or its power or burn off relays. and do this.go to your favourite chevy dealer and have the parts dept. tell you what the GM part numbers are for your two relays and the MAF. that way you are more likely to get the correct ones from oreilleys.i use the BWD select ones and although they are Chinese,they seem to last longer. as for a MAF "rich porter" makes NEW ones for our cars. quite pricy but worth it

 

I put on a new MAF and a bosch o2. The car starts and idles fine. But still has an SES light for low voltage to the o2? Any ideas?

 

the relay is probably the culprit. either it has failed or maybe the wrong part.now, you know that the MAF for 85s are different from all the rest??be sure you have the right one.check the voltage with a DVOM to confirm the low voltage.

 

If I jump on it it blows black smoke still? And bogs down

 

do you have any codes showing?

 

Only after about 20 minutes of driving an o2 code

 

a bad O2 sensor will make it blow black smoke and bog.i would at this point throw in a set of AC delco plugs and a new bosch O2 sensor.now that you have the other issues repaired. it would probably make it run right.finally

 

It has a new bosch o2. It didn't make a difference. It could have been bad though

 

if you replaced it while you had the other problems .its probably fuel saturated,which makes them fail.now that your other problems have been addressed. it should solve it

 

True, should I go with bosch again?

 

of course ,they are the best ones for our cars.