1989 Acura Integra Unstable RPM

Tiny
SHUVO
  • MEMBER
  • 1989 ACURA INTEGRA
  • 60,000 MILES
I have honda dual carb1.6L manual integra. My car starts after 3 or 4 attempts but dies immediatly, after many tries when it gets warm it starts but rpm is unstable sometime it reaches 1500rpm and suddenly it drops to 500rpm and at that time if I press on the gas it gives hickups if I can take rpm to 2000 or more it gets stable. I dont have a clue what is the prob if anyone can help me plz help. This car is very important for me.
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Friday, October 4th, 2013 AT 4:25 AM

10 Replies

Tiny
HMAC300
  • EXPERT
Check your fuel pressure as well as volume, should be in 1/2 pint range for 30 seconds 4 psi fuelpressure.
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Friday, October 4th, 2013 AT 6:52 AM
Tiny
SHUVO
  • MEMBER
Thanks hmac300 for your reply. Today when I was trying to start my car it started making a tin hitting noise and I noticed there was no compression in the engine, self starter motor running freely. After that I removed the spark plug from the engine and disconnected the distributor wire and cranked the engine and all four pistons were running but the sound was still there. I dont know whats the problem. Plz help me um in a very big problem this car is very important for me.
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Friday, October 4th, 2013 AT 11:48 PM
Tiny
HMAC300
  • EXPERT
If you don't have any compression you'll have to check vavles, maybe a chain/belt broke so if it didyou bent valves. It will need to be torn down further to see what is really wrong
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Saturday, October 5th, 2013 AT 5:51 AM
Tiny
SHUVO
  • MEMBER
Thanks again hmac300 for ur help. I just came from the mechanic, first when I showed him the car he heard the same noise n told me like u did that valves are bent or timing belt is torn but when he checked the engine by removing valve cover and timing belt he said it is ok. After that he tried to start the engine for half n hour at last the car started but again the rpm started jumping from 1500 to 500 n then it dies. My mechanic told me he doesnt have any clue what is happening. Actually here in my country honda cars are rare Toyota rules the road, mechanics know the toyo engine very well. Oh another thing I asked my mechanic about the fuel pressure n he told me its ok. If u can plz tell me which part controls the rpm n pickup it will be very helpful. U have already suggested me some fantastic ideas without seeing the car.
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Saturday, October 5th, 2013 AT 12:02 PM
Tiny
HMAC300
  • EXPERT
Check for a vacuum leak at manifold or base of car or any hose that has a hole init or is soft. Those are the major culprits. Also being a carb make sure the plate at base isn't hanging up on either the carb body or intake gasket. Then spray choke cleaner around shaft at bottom of carb it may be leaking there if rpms change while doing this you may have found your lealk
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Saturday, October 5th, 2013 AT 1:36 PM
Tiny
SHUVO
  • MEMBER
Hello hmac300 how r u? Thanx a lot for helping me so much. I've tried out every thing what u have told me. I've checked every hose every pipe there is n sprayed carb cleaner in the bottom of the carb but with no result. Now my mechanic is telling me my ecu is dead or faulty thats why this is happening. My ecu is PR6 it has led light at the center. The led doesnt flash when I turn on my ignition or start the engine it only flashes when I turn off my ignition for a fraction of a second, is it ok? Any suggestions will be very helpful. Thanx
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Monday, October 7th, 2013 AT 2:18 PM
Tiny
HMAC300
  • EXPERT
I'mnot familiar with that ecu but your mechanic is probably right I have no further suggestions.
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Monday, October 7th, 2013 AT 2:47 PM
Tiny
SHUVO
  • MEMBER
Thanx hmac300 for ur help. I know its a bit rude to ask u for help after u told me u dont have further suggestions sorry for asking for help again. Could u plz tell me there is a map sensor in the engine, mechanic is telling me thats the culprit the ecu is ok. Can I use toyota map sensor instead of honda in the engine is there any difference? It'll be very helpful if u can explain. There is three wires coming out of sensor its made by denso.
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Thursday, October 10th, 2013 AT 12:09 AM
Tiny
HMAC300
  • EXPERT
If it's made by denso it should be availablae most anywhere. Whether it is same as Honda I have no idea as they are built to different specifics. I'm sure that other manufacturers mak this as well like delco or willies parts. The car is certainly old enough that you canpick them up at an auto parts.
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Thursday, October 10th, 2013 AT 5:50 AM
Tiny
SHUVO
  • MEMBER
Thanx alot my friend for helping me out.
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Thursday, October 10th, 2013 AT 12:35 PM

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