No compression dilemma
07-09-2017, 05:11 AM
#26
Member
In the last couple of weeks, I put everything back together and had hard time with timing. It would crank but won't turn over.
Finding the TDC was easy but positioning the distributor was quite a challenge. I nailed it today and the engine is back to life.
It wasn't shaking at all and the compression all 8 cylinders are good. Disconnected distributor wire was the culprit.
This is the case of dishonest professional at the indy shop and a lousy diagnostic job at the dealer.
Finding the TDC was easy but positioning the distributor was quite a challenge. I nailed it today and the engine is back to life.
It wasn't shaking at all and the compression all 8 cylinders are good. Disconnected distributor wire was the culprit.
This is the case of dishonest professional at the indy shop and a lousy diagnostic job at the dealer.
07-09-2017, 08:52 AM
#27
Super Member
Thread Starter
Well, let's me filled in some of the blank:
First, this wasn't my car, it was my brother in-law and he lives 200miles from me. The guy asked me for an opinion after he took it in and the problem got worse. Take a note here: The Indy shop had their hands all over this car.
This was my advice. I told him to go to the dealer for a 2nd opinion.
This was my observation when he stopped by for a quick visit. I didn't know the seriousness of no compression issue at this point.
Now the rest of the story:
He was facing with a large repair so he decided to trade in. The dealer gave him nothing for it because of the violent shaking.
He had a business and the Indy shop guy came multiple times asking to buy the broken car from him. The offer price was higher than the market value of a broken car.
I wanted to learn about the engine rebuild so I offered to buy it. I drove it 200miles, it ran fine but it wanted to die at all intersection stops.
I posted multiple forums and I got scared from the responses so I told the guy that I changed my mind and wanted to return the car. He wasn't happy. So I tear the engine apart...
Originally Posted by DrDoe
Car was shaking in idle. Indy shop replaced plugs, distributor and wires. It's still shaking after parts replacements and the shop pointed to no compression on V8 cylinder #4. All other cylinders read 140.
Originally Posted by DrDoe
Took to another dealer for diagnostic and dealer said car needs a new engine.
Originally Posted by DrDoe
Car runs fine and no CEL but shakes violently in idle. Coolant reservoir showed low fluid but no leaks were found. Muddy sludges were found at the oil filling cap. Oil drained and no metal dust were found.
Now the rest of the story:
He was facing with a large repair so he decided to trade in. The dealer gave him nothing for it because of the violent shaking.
He had a business and the Indy shop guy came multiple times asking to buy the broken car from him. The offer price was higher than the market value of a broken car.
I wanted to learn about the engine rebuild so I offered to buy it. I drove it 200miles, it ran fine but it wanted to die at all intersection stops.
I posted multiple forums and I got scared from the responses so I told the guy that I changed my mind and wanted to return the car. He wasn't happy. So I tear the engine apart...
07-09-2017, 05:00 PM
#29
Super Member
Thread Starter
No. It isn't and my questions here weren't anything specific. It's the 7.4L 3/4 ton Suburban.
07-11-2017, 06:28 PM
#30
Senior Member
Ok your post is confusing on several things. First you originally posted that you were told your engine had no compression, then later you said different manner that you said your distributor was disconnected. Well first off, compression and lack of spark in a specific cylinder are not the same thing. Big difference! Secondly the W220 does not have a distributor at all. You have is coil pack. which you have two wires per cylinder coming from each coil. Let say you have a V-8 then you have 16 wires. the S430 and The S500 had two spark plug per cylinder. So which is actually the issue to begin with? Glad you solved your problem.
07-12-2017, 12:38 AM
#32
I knew it wasn't a benz from the start because something like that would have definitely thrown a code on a mercedes. Also having a problem like this is unheard of from a mercedes.
