88 lx 5.0 needs help!

pearce9906 · 12-06-2007, 12:28 PM

Thanks for the direction guys. I work tonight so I'll try swapping out the plugs first thing in the morning.
By the way, do you think it's possible fuel would have gotten into the sensors through the vacuum lines and ruined them? like the MAP sensor and the rest that have vacuum lines attached?

Thanks again, I'll let you know what I come up with.

Dark_5.0 · 12-06-2007, 04:56 PM

Quote:

Originally Posted by pearce9906

Thanks for the direction guys. I work tonight so I'll try swapping out the plugs first thing in the morning.
By the way, do you think it's possible fuel would have gotten into the sensors through the vacuum lines and ruined them? like the MAP sensor and the rest that have vacuum lines attached?

Thanks again, I'll let you know what I come up with.

I hydrolocked my 300zx last summer and it kept fouling the plugs cause water was pooled in the intake manifold. I removed all the spark plugs and jacked the car up on one side high as it would go to make all the pooled water run out of the intake and into the cylinders, then I turned it over in 20 second burst a few times and that seemed to work pretty well. All the water shotout the spark plug holes.

pearce9906 · 12-07-2007, 02:20 AM

This one was hydrolocked also, after the original regulator blew, before I changed plugs, when I took the old (original) plugs out, I turned it over in several short bursts and blew the fuel out of the cylinders, it was fuel. Yours was water?

Dark_5.0 · 12-07-2007, 07:19 PM

Quote:

Originally Posted by pearce9906

This one was hydrolocked also, after the original regulator blew, before I changed plugs, when I took the old (original) plugs out, I turned it over in several short bursts and blew the fuel out of the cylinders, it was fuel. Yours was water?

Yeah I drove through some deep water and well you know the rest.

pearce9906 · 12-14-2007, 12:48 AM

Well, I changed plugs out again, to no avail. EGR was bad, replaced it, as well as TPS, still not fixed. Noticed there were two vacuum solenoids on the right front inner fender on the the rear of the engine compartment that were damp with some gas, presumably from where the reg went bad and flooded the plenum and vacuum lines, I took them apart and cleaned them, that seemed to do the trick with getting the car running right and taking out the majority of the miss. But now I have severe idle surge, almost dropping to the point of killing itself, also running super rich. I've tried almost everything I can think of to narrow the problem down, but am having a heck of a time with it. Any ideas?
Keep in mind, I have just bought this car and don't have much idea about what mods previous owners have done to tune the car.

bailey_57 · 12-18-2007, 10:45 PM

did you replace the tps and set it? surging idle is a problem as old as the 5.0. if you go through a search for surging idle you probably will find quite a few threads. also before i had any mods, i had a surging idle and chased all the gremlins. i got rid of mine with a 1/8th in drill bit through the throttle blade. good luck.

pearce9906 · 12-19-2007, 01:56 AM

thanks for the reply baily_57, tomorrow is my day off so I plan to work on the car all day, hopefully I can chase my demon down, plan on setting the tps voltage, checking fuel pressure, checking compression, and possibly trying the codes, not throwing a check engine light tho, could mean the previous owner installed a chip or removed the bulb tho. Hopefully something will turn up tomorrow though, I am about at wit's end on this problem. Getting super frustrated. I'll post what I find. Thanks again.

12-06-2007, 12:28 PM	#1
pearce9906 Registered Member Join Date: Nov 2007 Location: OHIO Posts: 20	Re: 88 lx 5.0 needs help! Thanks for the direction guys. I work tonight so I'll try swapping out the plugs first thing in the morning. By the way, do you think it's possible fuel would have gotten into the sensors through the vacuum lines and ruined them? like the MAP sensor and the rest that have vacuum lines attached? Thanks again, I'll let you know what I come up with.

12-07-2007, 02:20 AM	#3
pearce9906 Registered Member Join Date: Nov 2007 Location: OHIO Posts: 20	Re: 88 lx 5.0 needs help! This one was hydrolocked also, after the original regulator blew, before I changed plugs, when I took the old (original) plugs out, I turned it over in several short bursts and blew the fuel out of the cylinders, it was fuel. Yours was water?

12-14-2007, 12:48 AM	#5
pearce9906 Registered Member Join Date: Nov 2007 Location: OHIO Posts: 20	Re: 88 lx 5.0 needs help! Well, I changed plugs out again, to no avail. EGR was bad, replaced it, as well as TPS, still not fixed. Noticed there were two vacuum solenoids on the right front inner fender on the the rear of the engine compartment that were damp with some gas, presumably from where the reg went bad and flooded the plenum and vacuum lines, I took them apart and cleaned them, that seemed to do the trick with getting the car running right and taking out the majority of the miss. But now I have severe idle surge, almost dropping to the point of killing itself, also running super rich. I've tried almost everything I can think of to narrow the problem down, but am having a heck of a time with it. Any ideas? Keep in mind, I have just bought this car and don't have much idea about what mods previous owners have done to tune the car.

12-18-2007, 10:45 PM	#6
bailey_57 Registered Member Join Date: Mar 2000 Location: Berwick,Pa Posts: 127	Re: 88 lx 5.0 needs help! did you replace the tps and set it? surging idle is a problem as old as the 5.0. if you go through a search for surging idle you probably will find quite a few threads. also before i had any mods, i had a surging idle and chased all the gremlins. i got rid of mine with a 1/8th in drill bit through the throttle blade. good luck. __________________ '89 GT hatch back performer rpm intake, performer rpm cylinder heads, fms e-303 cam, kirban adj fp regulator, holley 65mm tb, harland sharp 1.6 roller rockers, alum driveshaft, 3.73 gears (283 rwhp, 303 rwtq new numbers with new heads)

12-19-2007, 01:56 AM	#7
pearce9906 Registered Member Join Date: Nov 2007 Location: OHIO Posts: 20	Re: 88 lx 5.0 needs help! thanks for the reply baily_57, tomorrow is my day off so I plan to work on the car all day, hopefully I can chase my demon down, plan on setting the tps voltage, checking fuel pressure, checking compression, and possibly trying the codes, not throwing a check engine light tho, could mean the previous owner installed a chip or removed the bulb tho. Hopefully something will turn up tomorrow though, I am about at wit's end on this problem. Getting super frustrated. I'll post what I find. Thanks again.