Hi all,
My first time here. I did do some searching here but not much luck.
My problem just started out of the blue. Haven't done anything to the car in a while and it has been running good.
On the way home from work Friday I was just pulling away from a red light and had a stumble, pat the peddle a little and it went back to doing fine. (kinda like a plug wire going bad. quick short and back to ok)
Monday going back to work same thing, quick die and back to ok. then setting at the next red light idling fine then out of the blue idle drops to 3-400 rpms running ruff. I popped it out of gear to N and pat the gas and it revs and go back to idling fine. So this morning same thing idle drops at light and go's dead I re-crank it and its fine.
So I get home at lunch and go to looking and poke'n around to see if I can find what the problem is.
With the car idling I was able to make it do the same things by moving around the map sensor wiring plug. just touching the connecter made the idle drop and run ruff. so I pulled the map looked it all over, all looked ok, no brakes in the wire I can find. so I scraped the contacts on the map and in the wire plug put in some dielectric grease in the plug and re-installed.
Much better now but I can wiggle the plug(with out removing it) and can make the idle drop like before but not near as bad as it was.
My question is has any one had a intermiting map sensor??

thanks for any help,
Grayhook

 

May help if I added it's a 2000 accord ex 4i auto. All so I have no check eng. light, did pull codes but there were none.

 

Yes. I actually used connectors and wired up a prelude map sensor in place of my existing accord map sensor before when I was chasing an issue with my swap and I fixed the original issue by doing something else and then I started running into the same exact issue as you. I wound up crimping down my connector better and the issue has completely went away. My guess is that when I used my connectors I only barely made it crimp on the connector so when I would take off the connector would wiggle it would open up for a second.

I think you already know you have an issue with the connector. The best thing to do now is to take the connector off and test the connector. Should be 5v on one, signal on another, and ground on the last one. If that checks out you will need to plug in the connector and backprobe behind the wires coming out of the map sensor and test for the same. As you test each and every wire, wiggle it til you find the faulty one. Then you will need to fix it.

 

If the test on the wires pans out........I must say this is "out there". Check/replace the o-ring on the MAP sensor, there have been times when the o-ring is bad and allows air to pass by messing up the readings.....rare but has happened.

 

Thanks for the reply's.
After my clean and grease job, I have done two 10ml. trips and a few trips to work and back(4ml. each way) with no problems so far. I did VM test and all seem good on the wires so I'm thinking it was contacts. Looking around feeling hoses for a vac. leak is how I came to bump the wire and find this in the first place.
Out of the blue like that, Yes it does seem "out there".