Question about 1991 Chevrolet S-10 Blazer

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I have a 1991 K-Blazer that we rebuilt a high output jasper engine for that came out of a 1984 Caprice, it keeps fouling the plugs after only running for a short while

Everything has been replaced, the Mass air flow sensor, fuel injectors, fuel pump. It will run fine for a short while with plenty of power then the plugs start fouling out. You can smell it running rich out the exhaust. The engine is a Jasper 305 High output that we rebuilt out of a 1984 Chevrolet Caprice.

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  • Contributor
  • 25 Answers

EGR valve sticking or bad vacuum leak, might be a place to start. I presume the ECM, control module are functioning properly?

Posted on Apr 21, 2014

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Posted on Jan 02, 2017

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dennymulford
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SOURCE: I have a 2000 Chevy Blazer I have replaced

maf sensor, tps sensor,or timing gear

Posted on Apr 16, 2009

hawkwindbear
  • 5 Answers

SOURCE: 1987 chevy engine problem

you have to reset base idle see manual at library for procedure

Posted on Jul 19, 2009

  • 5 Answers

SOURCE: 1987 Chevrolet S-10 Pickup1987 chevy s10 2.5l tbi

Check the trottle body postioning sensor...

Posted on Jul 19, 2009

pippall
  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

  • 2 Answers

SOURCE: I HAVE A 1993 CHEVY S10 BLAZER RUNS GREAT BUT NOW

I pretty much had this same problem what your problem is going to be is more than likely you have a pin hole leek in one of the fuel lines inside the plenum .

Posted on Jan 11, 2010

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Carburetor in my 84 nissan pickup will not idle down from 3500 rpm, why won't it idle down


Hi Shane,I have a 85 Nissan 720 4x4 with the 2.4 engine,had her for 22 years,our trucks have bad carburators,when I bought mine used,it had 108,000 miles on it and my carb started giving me problems,with the ideling,took it and had it rebuilt by 3 different carb shops at 200 a whop,no one could get it right,so I took it to the Nissan Dealer,they told me that they couldn't rebuilt it cause the bottom part is not assible,and told me that they were a bad design,so I did some research and found out about Weber carburators,so I bought one from redline,they cost 269.00 with kit,it's been on my 720 for 6 years now,plus I got a new remanufactured engine from Jasper engines and had a jasper installer put in in at the same time I put the new weber in.I spent a fortune trying to get the stock carb. right.I have 328,000 miles on the truck and it runs perfect.I plan on keeping my truck forever and that's the reason I put alot of money in it,A couple of months ago I redid the interior,it is now gray,was black,I live in Georgia and it is hot.Here's a video of mt Weber conversion,I have more pics and videos in you would like to see.My phone number is 706-580-6110 and my name is Tommy.https://www.youtube.com/watch?v=v5Fe9N0q2Kk

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One plug foul after 200 miles runs ruff


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I have a 1987 caprice clasic with a 305 v8 2 barrel that I have to pump the gas pettle to keep it running. could this be the carb or the fuel pump?


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Hello: If the engine is racing (high RPM) when only going 12mph the it sounds like the transmission is slipping. (I grew up in southwestern Minnesota)

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Changed 5.7 350 motor in 87 chevy k5 blazer with same from 90 caprice, motor's only mod. was using throttle body from previous motor. Full tune up but from 35mph to 45mph it lacks power and drinks gas...


If you are set on using this engine for its increased power and fuel efficiency, the only way you will realize these benefits is by changing the ECM/PCM from the engine donor vehicle to yours, put the 90 model engine's throttle body back on it, use the engine wire harness from the donor vehicle--in other words, the engine has to think it's still in the Caprice, and the only way to do this is to put the Caprice electronics and fuel management system (throttle body) back on it. If you have to modify the throttle linkage, the kick-down/TV cable, to make it work, then do it. Also, you will have to put an Oxygen sensor from a 90 Caprice into the manifold/collector/crossover pipe of your vehicle, and not one for the 87 truck. If it wont fit, plug the factory hole on your truck's Oxygen sensor location with a threaded plug using high-temp thread sealant, cut/weld in a proper-threaded orifice for the Oxygen sensor from a 90 Caprice. If the Caprice had two Oxygen sensors, you will have to put one on each cyclinder bank's exhaust outputs.
Swaps such as these are great if all the details are attended to, but headaches if you just try to throw and go.
If you do all this, the codes will not come back after you reset them, the engine will run great, you will have better power and greater fuel economy (the Caprice and the Blazer weigh within a couple hundred pounds of each other), and you will have a 1987 K5 Blazer which "thinks" it's a 1990 Caprice.
And remember when buying engine parts in the future to tell the counter guy "It's for my other car--the 1990 Caprice."
You get less **** out them that way.

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You can buy rebuilt engines through your local auto parts store or look on-line for companies like Jasper. Also, some mail order auto parts dealers like JC Whitney sell engines.

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