Author Topic: Loss of power and skipping after injector rebuild(N/A Diesel (Read 4968 times)

Dizzy · « **on:** July 21, 2007, 06:38:51 pm »

I have to ask ( I have posted on another forum and had no follow ups )
I dropped of my 85 Golf N/A diesel to have the injection pump gone through. It was leaking. But the car ran Strong ( OK not a race car, but strong for what it is ) . It has taken forever to get it back,So they said they would work on it today. I went down there and it is all back togeather. They resealed the pump and replaced a few wearing parts, New timeing belt ect. The car is skipping bad, and has no power. They seam to think it might be a tight valve ?? They have it narrowed down to the 4th cyl. I spoke with the prevoious owner becasue I rembered him saying somthing about turning up the injection pump( the shop has set it to factory spec's ). But he had just given it a little more fuel for a tad more omphhh !
Needless to say the car is still there. They will work on it agian Monday. Any ideas on what could cause this loss of power and skipping on the 4th cyl. They said when they pull the fuel line on #4 now there is no change in the idle. This car ran fantastic when it was taken in. Just had a fuel leak ( not even a bad one ) The shop mainly rebuilds injection pumps, and Turbos.It is a good size place. Just has me worried. Any Ideas

??
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burn_your_money · « **Reply #1 on:** July 21, 2007, 07:14:36 pm »

They might have installed a bad injector, it's not uncommon if it was not bench tested first.

You should get them to advance the timing a bit too, that usually helps

Vincent Waldon · « **Reply #2 on:** July 21, 2007, 07:18:46 pm »

Stick to your guns son... if it is running worse now then when you brought it in they did something bad....

Vince

Dizzy · « **Reply #3 on:** July 21, 2007, 07:55:30 pm »

thats what I fear !

Black Smokin' Diesel · « **Reply #4 on:** July 22, 2007, 11:28:22 am »

If they pull the fuel line on #4 and it doesn't change anything then the injector isn't bleeding properly or it's defective. Tight valve? nope. Tell them to replace injector #4 or to pop-test all 4 of them. You're running on three cylinder and only have 54hp with four, do the math

However, you shouldn't pay for the time they put on the car if the part they installed are defective.

Dizzy · « **Reply #5 on:** July 22, 2007, 01:15:57 pm »

They said they pulled that injector and cleaned it. They didn't mention if it was getting fuel. I would think ( hope ) they checked that.
If they don't have the valves/injector timed right, could it have caused any engine damage ? That is my main fear at the time.
I asked them if they could do this job and they said yes without blinking an eye. It really worries me, because it ran so good when i took it in. I wouldn't drive it the way it is running now, period.
They said that it might have a sticking ( tight ) valve on 4. I'm woried that it might be bent ( or worse yet ) from the timing being off.

Dizzy · « **Reply #6 on:** July 22, 2007, 01:16:38 pm »

By the way thanks for the thoughts.

Black Smokin' Diesel · « **Reply #7 on:** July 22, 2007, 01:55:17 pm »

Quote from: "Dizzy"

If they don't have the valves/injector timed right, could it have caused any engine damage ? That is my main fear at the time.

If the pump isn't timed right it won't cause engine damage but if the crank/cam timing isn't spot on, the pistons could say hello to your valves... and it's not a friendly hello.

burn_your_money · « **Reply #8 on:** July 22, 2007, 06:40:31 pm »

You can't clean the injectors, they need to be rebuilt.

Valves don't magically start sticking overnight, if that is actually the problem they probably did something wrong

Dizzy · « **Reply #9 on:** July 23, 2007, 05:44:51 pm »

Well looks like Bad News , I called this morning and got another employee on the phone. He told me That Tim is on Vacation for a week, but he watched him time the car. I asked how they did it. He mentioned lining a line stright up and looking thru a plug on the Transmission

He also said there is only one way it will work. He thinks the car has a bent Valve ! I told him " The only way a valve could be bent is if the timing was set wrong". I was working out of town and unable to get down there. However I'm off tomorrow and will be there first thing in the morning. I guess I'll find out soon enough how bad this really is.

Black Smokin' Diesel · « **Reply #10 on:** July 23, 2007, 06:09:20 pm »

Quote from: "Dizzy"

Well looks like Bad News , I called this morning and got another employee on the phone. He told me That Tim is on Vacation for a week, but he watched him time the car. I asked how they did it. He mentioned lining a line stright up and looking thru a plug on the Transmission He also said there is only one way it will work. He thinks the car has a bent Valve ! I told him " The only way a valve could be bent is if the timing was set wrong". I was working out of town and unable to get down there. However I'm off tomorrow and will be there first thing in the morning. I guess I'll find out soon enough how bad this really is.

He was putting the crank on TDC (marked on the flywheel when you look into the hole in the tranny). Then you set the cam so the lobes for cylinder #1 are pointing up and you lock it with a special tool.

Vincent Waldon · « **Reply #11 on:** July 23, 2007, 06:23:07 pm »

And if he didn't mention the phrase "dial gauge" then he didn't check the timing.

Bottom line: the car is running way worse than when you took it to them (if you had a bent valve you would have noticed it before)... they need to fix it !!

burn_your_money · « **Reply #12 on:** July 23, 2007, 06:28:25 pm »

It sounds like he physically timed the engine correctly based on the vague description you were given however as mentioned without the term " dial gauge" there is about a 1/1000 chance it is properly timed. Assuming that the timing was done correctly they either messed up the reseal or installed a bad injector

Dizzy · « **Reply #13 on:** July 23, 2007, 08:00:01 pm »

Compression/injector check- Will tell them I want one while I wait. Thanks

burn_your_money · « **Reply #14 on:** July 24, 2007, 08:38:05 pm »

Tell them you don't expect to pay for it either....