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No Pull + Massive backfire


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#21 81zfan

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Posted 02 August 2019 - 07:40 AM

Did you ever clean and regrease the Distributor like Mark suggested?
Do you have a way to watch fuel pressure?
Have you checked Vac Lines and Intercooler tubes?
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#22 TroyStarion

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Posted 02 August 2019 - 07:47 AM

View Posttsi_tom, on 02 August 2019 - 07:35 AM, said:

I would check the grounds to the block and injection system.  The pickup coil resistance on the distributor and the temperature coolant sensor.  Are the vacuum lines good and routed correctly?
Is the distributor put in correctly for timing?

Will check dizzy as well as grounds and connections, vacuum lines are all routed correctly. I think I may have a fuel pressure tester...

Edited by TroyStarion, 02 August 2019 - 08:33 AM.

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#23 kaaos

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Posted 02 August 2019 - 05:44 PM

Sounds kinda like the problems I have been chasing on my car. I got a fuel gauge under the hood. I verified with a go pro it was good pressure raised under boost. its a Tre performance walbro 255 ( so probably not a walbro 255) Although the drainback valve doesn't work (Thanks TRE  ) I looked at everything else. seems like a misfire under boost. falls on its face. just feels like the turbo is slowing it down. Mine doesn't backfire but instead just feels like a misfire.

with the valvetrain noises your hearing I worry it may be the base timing off.
take a look at what Shelby posted here. and to quote scott87star "Crank at TDC, 0 on crank pully, cam dowel pin will be slightly left of top."
as for my car I tried this method, But still not sure my timing is correct.
http://www.starquest...howtopic=135545
My valvetrain also got noisier I had to replace my hyd lifters as some of them collapsed.

also here is a good thread with someone with similar problems http://www.starquest...ic=153561&st=40 I am currently reading it and thinking about getting my car to run properly too.

Edited by kaaos, 02 August 2019 - 10:20 PM.

Maf-t Gen 2 gm 3" maf
Rebuilt motor Wiseco 8.0 compression forged pistons
Race prepped rods
Arp rod and headgasket studs.
Headworks valve Job factory polished valves Polished chambers
1989 ECU, BSEK, Ajusa HG, Extensively ported and polished head (Alabama NJV)/intake/exhaust manifolds, Aeromotive fpr, Hallman MBC, all new brakes and bearings, *DM 2.5" exhaust with a Hooker Aerochamber.
stock 12a, hope to change soon to a small 16g.
240mm Fidanza aluminum 10.5 pd flywheel xtd 225mm clutch
1989 Transmission with 36k

#24 TroyStarion

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Posted 02 August 2019 - 07:27 PM

So I checked timing with a timing light and it was close enough to 10° BTDC, checked that all wires were getting spark, pulled plugs and they looked awful, white tipped and black ringed... Put in some used ones hoping the plugs were fouled but to no avail. Car sounds REALLY loud in the top end, like a manifold leak but I don't know if it cracked or something went wrong in the valvetrain. It was always loud since the day I first fired it up. And yeah kaaos mine is also more like a misfire than a backfire, motor just runs really rough, the noisy top end in combination with the misfire isn't showing any good signs...

Edited by TroyStarion, 02 August 2019 - 07:58 PM.

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#25 TroyStarion

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Posted 02 August 2019 - 10:33 PM

Pulled the valve cover off... Cly. 1 Exhaust valve rocker arm looked like this:

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#26 TroyStarion

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Posted 02 August 2019 - 10:39 PM

.

Edited by TroyStarion, 02 August 2019 - 10:50 PM.

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#27 kaaos

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Posted 03 August 2019 - 10:47 AM

Damn sorry to hear, not sure what would have caused that. if it was just a collapsed lifter. perhaps an oil delivery problem? I did find my problem too, Well one of them! i just verified my base timing is off a tooth. sits at 15degrees atdc on the crank mark when the cam mark is right where everyone else's is.
Maf-t Gen 2 gm 3" maf
Rebuilt motor Wiseco 8.0 compression forged pistons
Race prepped rods
Arp rod and headgasket studs.
Headworks valve Job factory polished valves Polished chambers
1989 ECU, BSEK, Ajusa HG, Extensively ported and polished head (Alabama NJV)/intake/exhaust manifolds, Aeromotive fpr, Hallman MBC, all new brakes and bearings, *DM 2.5" exhaust with a Hooker Aerochamber.
stock 12a, hope to change soon to a small 16g.
240mm Fidanza aluminum 10.5 pd flywheel xtd 225mm clutch
1989 Transmission with 36k

#28 TroyStarion

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Posted 03 August 2019 - 01:38 PM

View Postkaaos, on 03 August 2019 - 10:47 AM, said:

Damn sorry to hear, not sure what would have caused that. if it was just a collapsed lifter. perhaps an oil delivery problem? I did find my problem too, Well one of them! i just verified my base timing is off a tooth. sits at 15degrees atdc on the crank mark when the cam mark is right where everyone else's is.

I don't think the lifter was bled, or something because that tapping was loud from the start. Any guru want to tell me what I should do, replace all of the lifters or just that one? I'm also gonna get a new rocker arm because it looked like it was wearing at the bottom. I'm gonna pull the assembly, see if my valve stem is bent, I may even replace that spring retainer too if it looks bad enough. This sucks...

Edited by TroyStarion, 03 August 2019 - 01:40 PM.

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#29 tsi_tom

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Posted 03 August 2019 - 01:41 PM

Quote

Engine is rebuilt with 800 miles, balance shafts are removed as well as a NJV head... will do those tonight.

Why was the engine rebuilt?
Engine
20 over forged pistons
Stock injection system

My restoration project: The Missouri Project

#30 TroyStarion

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Posted 03 August 2019 - 02:02 PM

View Posttsi_tom, on 03 August 2019 - 01:41 PM, said:

Why was the engine rebuilt?

I got the car April last year with around 3,000 miles on a rebuilt motor, 6 months and about 1,000 miles later, it spun two bearings (cyl. 2 and 3) while I was driving to work on the highway. I had the longblock assembled for peace of mind... or so I thought.
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#31 TroyStarion

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Posted 03 August 2019 - 03:39 PM

So I think I know what I'm gonna do, buy an entire set of lifters from DAD and bleed them:
http://www.starquest...howtopic=131457
Then, when the rocker assembly is off I'll check if the retainer is damaged and the valve visibly bent. Put everything together using the FSM. Anybody know if I need those clips for the lifters or if I can throw them in without the clips?
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#32 tsi_tom

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Posted 03 August 2019 - 04:03 PM

Just checking but did you clean the oil cooler after the motor spun the bearing?  Was the head disassembled and cleaned too?

When you rebuild a motor I would first check that oil is getting to the head before letting the car run.  

Also wasn’t the tap loud loud enough to hear?
Engine
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Stock injection system

My restoration project: The Missouri Project

#33 TroyStarion

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Posted 03 August 2019 - 05:53 PM

View Posttsi_tom, on 03 August 2019 - 04:03 PM, said:

Just checking but did you clean the oil cooler after the motor spun the bearing?  Was the head disassembled and cleaned too?

When you rebuild a motor I would first check that oil is getting to the head before letting the car run.  

Also wasn't the tap loud loud enough to hear?

Oil was getting to the head and from what my builder told me he reassembled it. Remember this thread?
http://www.starquest...opic=156809&hl=

Edited by TroyStarion, 03 August 2019 - 05:53 PM.

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#34 tsi_tom

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Posted 03 August 2019 - 05:59 PM

View PostTroyStarion, on 03 August 2019 - 05:53 PM, said:



Oil was getting to the head and from what my builder told me he reassembled it. Remember this thread?
http://www.starquest...opic=156809&hl=

No,  I forgot.  Ok good that you checked.  That should have been really noisy though.
Engine
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Stock injection system

My restoration project: The Missouri Project

#35 TroyStarion

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Posted 03 August 2019 - 06:09 PM

View Posttsi_tom, on 03 August 2019 - 05:59 PM, said:

No,  I forgot.  Ok good that you checked.  That should have been really noisy though.

It was noisy, but it had been so long since I drove it last that I didn't remember that it wasn't normal. And the lifter must've collapsed as I was priming the oil system because when I first started it up after the rebuild it was noisy.
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#36 croquest87

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Posted 03 August 2019 - 06:33 PM

View PostTroyStarion, on 03 August 2019 - 06:09 PM, said:



It was noisy, but it had been so long since I drove it last that I didn't remember that it wasn't normal. And the lifter must've collapsed as I was priming the oil system because when I first started it up after the rebuild it was noisy.
Sure is collapsed. I would replace them all  they are cheap. Are you absolutely sure that your valve is not stuck or very hard to move due to bad valve or valve guide that is damaged and moved out of its place preventing movement of things. Perhaps some measurements and camera inspection if it was my ride.

Edited by croquest87, 03 August 2019 - 06:42 PM.


#37 TroyStarion

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Posted 03 August 2019 - 06:53 PM

View Postcroquest87, on 03 August 2019 - 06:33 PM, said:


Sure is collapsed. I would replace them all  they are cheap. Are you absolutely sure that your valve is not stuck or very hard to move due to bad valve or valve guide that is damaged and moved out of its place preventing movement of things. Perhaps some measurements and camera inspection if it was my ride.

Will check valve by pushing it down. Crossing my fingers I don't have to take the head off.
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#38 Indiana

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Posted 05 August 2019 - 11:03 PM

Either it was completely worn out which rarely happens or a moron that thinks they are an engine builder put them in a vise to compress them- which destroyed them

I'd change em all out.

The lifters have a check valve in them and that must be released to clean and compress them.

#39 TroyStarion

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Posted 11 August 2019 - 01:11 PM

View PostIndiana, on 05 August 2019 - 11:03 PM, said:

Either it was completely worn out which rarely happens or a moron that thinks they are an engine builder put them in a vise to compress them- which destroyed them

I'd change em all out.

The lifters have a check valve in them and that must be released to clean and compress them.

Thanks and happy birthday Indiana. Got lifters from DAD, and a NOS rocker from eBay. Got em squishy and compressed the RIGHT way (it's better to use a small allen wrench than a paper clip I've found).
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