Author Topic: 68 250sl runs much better....90%... (Read 23037 times)

amg65ri · « **Reply #25 on:** May 14, 2011, 00:54:22 »

Joe,

thanks for all your help so far!!! I have got the car running for as long as I want... It takes 3-4 secondes to start when warm, but I am able to drive it on the street and I filled it up with gas today!!! i shut it off at the station not knowing if it would start again... it did!!!

I am not using starting fluid anymore.... I think it affects the oil, that and the fact that I think i was running gas into the oil, I am going to change it again...

I still feel some hesitation but the car is so smooth at 60mph.... Also with the windows down their is harldy any air blowing around in the cabin!! Excellent enginerring....

I want to fix the stumble and iron out the starting issues. I do think the wrd has something to do with it... I noticed that it does extend and geive more fuel to the car. After a while of not being able to start the car, I removed the wrd and it started just fine, but I nneded to put it back or it would die....

Lots to still figure out, but at least I can drive it.... I will work on the wrd tommorrow... i plan on changin the oil and again in 4 days to see if I am running too rich....

thanks again... heres a pic after the drive today..... only 10miles....

ja17 · « **Reply #26 on:** May 14, 2011, 04:41:25 »

Hello, nice to know your on the road again. You may want to check the linkages also. Hesitation is usually a lean situation at low throttle.

Happy motororing !

Joe

amg65ri · « **Reply #27 on:** May 14, 2011, 23:40:07 »

NEW iSSUES....

The car wont start?

1:I checked spark... all plugs are set and great.... they are all producing a good spark (plugs are new)

2:Timing is set at the right area...

3:Throttle linkage looks good.

4: Tank is full (just got gas)

5: Fuel is making it to the injectors....

6: All 6 IP pistons are pumping fuel.

7: Battery is good.....

8: IP rack moves freely...

No idea what is wrong... Is their anything else that will stop it from running? Some sort of fuel cut off or something? Even if I put starting fluid in it it only running for a few seconds....

Is it not getting fuel? air? maybe its a solenoid on the ip pump? I have no idea.....

thanks...

Iconic · « **Reply #28 on:** May 14, 2011, 23:47:54 »

Did it die while you were driving it and it won't start or will it not start when cold?
The good news is once you figure this out, you will feel as good as you did yesterday when you drove it.

amg65ri · « **Reply #29 on:** May 15, 2011, 01:11:13 »

It will not start when cold.... it seems to want to start... every few cycle it almost kicks over but nothing.... even starting fluid doesnt seem to help much... i have no idea how i started it the other day....

dseretakis · « **Reply #30 on:** May 15, 2011, 03:08:48 »

I know you say your plugs are new but how new? Did you replace them early on while working on the IP? If so you might want to just put in another set.

amg65ri · « **Reply #31 on:** May 15, 2011, 17:09:32 »

ok, got another set of bosch plugs... still no luck...(plugs I took out seemed very clean although they only have 12miles on them)

Went thru the linkage tour twice... no issues... car will not start at all.....even with starter fluid it barely catches..

Could I not have the correct fuel pressure? Does the rack need a certain amount or is it just a flow rate? I do have fuel at the injectors, but maybe its not enough? is theior a pressure valve that could be wide open or in need of repair? I think I see something after the fuel line leaves the rack...before it goes to the tank...

(is their a carburated conversion kit? just kidding....)

car looks nice in the driveway at least....

J. Huber · « **Reply #32 on:** May 15, 2011, 20:27:41 »

Just a thought -- is your ThermoTime Switch working?

I chased cold starting issues for a long time -- turned out to be the TTS.

Before that there was once a tip when LaurieMerc gave me (how's that for a name from the past? you old-time Dorian folks)...Gal knew her mechanic stuff...but I digress....

After cranking and cranking with no start, she suggested pulling out the fuel pump fuse, and trying it. It worked! short term until I discovered the TTS.

jacovdw · « **Reply #33 on:** May 16, 2011, 08:17:39 »

Quote from: amg65ri on April 30, 2011, 17:40:40

...

2:replaced plugs, wires, cap and checked points (working)

Hello Ben,

You mentioned in your first post that you checked the timing and points and found them working.

Did you check the condition of the points and the dwell angle perhaps?
Did you change the condensor associated with the points?

If you have new plugs (NON RESISTOR) that are properly gapped for the standard ignition setup (0.7 mm), fuel going to the injectors and compression, the engine will start.
That is based on the points and condensor being new and properly adjusted.

Dwell angle should be 38° -1° +3° (meaning a range of 37° to 41°).

Also check the connecting post (or screw rather) going through the distributor wall. If the insulating washer is cracked or damaged you could short the ignition to ground and the result would be no spark.

I would recommend that you revisit the points and condensor setup and replace with new components.

Hope this helps.

ja17 · « **Reply #34 on:** May 18, 2011, 05:18:53 »

Hello,

A fuel pressure check and fuel volume check should be next. Most likely more contaminated fuel in the system? You can manually trip the cold star valve by touching a hot lead to the solenoid on the CSV.

amg65ri · « **Reply #35 on:** May 27, 2011, 16:32:15 »

Hello Everyone...

I have been busy tracking down resto parts.... So far the forum has been excellent from helping me get this running to selling me parts!!!. I got used original bumpers, door panels, seat frame, leather seat covers, locking gas cap etc etc etc...

You all know who you are... Everything i bought was in perfect condition and i could not be happier...

pics will follow soon...

Question:::

The car has been thoroughly gone through... points, timing , compression, fuel, IP rack, linkage calibration, csv... all electronics... It is all in good spirits and within spec (compression was all within 2-4 lbs!!!)

1: The car will start imeadiately after a night of sitting, but after its warm you need to crank for 4-5 seconds.

2: The car will eventually die when idling... You can drive it fine but it wants to die at idle... (fuel? air ? timing?)

3: There seems to be slight hesitation from the acceleration, and a bogging when under load under 2k rpms.. is this timing?

thanks
ben-

ja17 · « **Reply #36 on:** May 27, 2011, 23:13:59 »

Hello Ben,

Sounds like your car is going lean after warm up. Do you know how to do the split linkage test ?

glenn · « **Reply #37 on:** May 28, 2011, 02:58:54 »

Try 'Engine Release' a product out of Quebec(Google it). Works where PB, deep creep, kano, mystery oil, etc. are useless. $25 for 8 oz. Worth it.

amg65ri · « **Reply #38 on:** June 08, 2011, 04:31:36 »

thanks I will get "engine release" and report on it...

Car is doing great, or at least driveable... I have created a hack mode to get it operational.... the issue I have currently with the car is that cold start is perfect, but I need to energize the CSV for a second to get it to start again once warm...One would think that either the idle air screw is too open or throttle plate is open but they are not... I first noticed it after the car was warm. Even after driving for 10 miles at 60mph, if I came to a stop the rpm's would drop and the car would shut off.... starting was almost impossible unless i energized the csv or used starting fluid....which is not safe at a busy intersection. i rigged up a momentary push button that works great for now... (dont worry I did not drill any holes or mount this hack job) but I want to fix it...

I am very close to having this car be back in its glory.... any pointers?

ja17 · « **Reply #39 on:** June 08, 2011, 05:25:51 »

Hello,

Were you able to do the split linkage test when the car was warmed up ?

Also I would check the starting aids when warm. Do you need the procedure?

dseretakis · « **Reply #40 on:** June 09, 2011, 03:44:29 »

It sounds like your car is ready for a trip to Arundel this weekend. Gernold will sort it out for you.

glenn · « **Reply #41 on:** June 12, 2011, 23:10:16 »

If I remember correctly, the rack should move more than 1/2 inch. At least an inch???

amg65ri · « **Reply #42 on:** July 09, 2011, 10:07:59 »

I figured i would give an update... The car is doing great.... or at least much better.. I drove it for the first time yesterday over 25miles.... I finally got my custom license plate....

"PAGODA" i was amazed it was available....

Only issue I have now is the WRD... i have found that it works great when cold, but as the car warms up is slowly kills the car. I think the rod that extends into the FI pump travels too far and is leaning out the mixture as it warms up... for now I disabled the WRD and made an adjustable version (using a mod from a fellow list member) I wil try and figure out the WRD after summer when I have more time to work on the car and less sun to drive it...

here is a pic of the plate!!!

dseretakis · « **Reply #43 on:** July 10, 2011, 02:21:24 »

I'm glad you have it running well enough to enjoy this summer. Great score on the plate!

News:

Author Topic: 68 250sl runs much better....90%... (Read 23037 times)

amg65ri

amg65ri

amg65ri

dseretakis

amg65ri

jacovdw

amg65ri

glenn

amg65ri

dseretakis

glenn

amg65ri

dseretakis