Recent content by 99Classic
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9
5.7 Vortec cold tap/knock HELP!
Okay, then I won't exactly worry about it much then. If it was causing bad mileage then I'd do something about it. Thanks for the info. It's nice to get some knowledge from you wizards! :cheers:- 99Classic
- Post #37
- Forum: Engine Performance + Maintenance
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9
5.7 Vortec cold tap/knock HELP!
Yeah it was an aftermarket one. Got it off amazon because money was tight at the time. 110$ for this one or 270$ for a remanufactured one so I went with the cheaper option. When I pull the intake to do lifters I will definitely try your method and spin the gear 180⁰. It seems right in that range...- 99Classic
- Post #35
- Forum: Engine Performance + Maintenance
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9
5.7 Vortec cold tap/knock HELP!
Oh boy. So with the reading out of spec could that be causing my crappy fuel economy? I can imagine batch firing the injectors would cause her to drink fuel.- 99Classic
- Post #33
- Forum: Engine Performance + Maintenance
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9
5.7 Vortec cold tap/knock HELP!
Yeah I'm up in Canada and with the wind chill she hit -58⁰ farenheit last night. Not too fun lol. When I adjusted the timing we got it on the proper tooth but the closest we could get it was +6⁰ of cam retard after turning the distributor all the way clockwise. Maybe need another tooth...- 99Classic
- Post #31
- Forum: Engine Performance + Maintenance
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9
5.7 Vortec cold tap/knock HELP!
So another really late update. Sorry yall. Got my lifters in the mail. Rockauto "ultra power" lifters. They seem really decent. Got them for 7$ each. Gonna see if it helps. On the cam timing aspect I was using a 1200$ scanner and the computer automatically advances the timing based on its cam...- 99Classic
- Post #29
- Forum: Engine Performance + Maintenance
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5.7 Vortec cold tap/knock HELP!
So late update. The acceleration tap has slightly resolved. I readjusted the rockers and the lifters are definitely the culprit. The acceleration tap was partially because of preignition. I was getting 9-10 mpg highway. Set the distributor to the correct position using a scanner. The timing was...- 99Classic
- Post #9
- Forum: Engine Performance + Maintenance
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5.7 Vortec cold tap/knock HELP!
It was pretty gunked up. We let the lifters sit overnight in something, my dad was helping so not too sure what they sat in. I've flushed the engine lots so far, 3 filters and 4 changes. 1 of the changes was with fresh oil and marvel mystery oil. Now it has high mileage pennzoil 5w30 full...- 99Classic
- Post #7
- Forum: Engine Performance + Maintenance
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5.7 Vortec cold tap/knock HELP!
I've been hearing a slight tap still at hot idle now so I've pretty much determined it's a badly adjusted rocker arm. Seems to be the cheapest thing for now. I'll do lifters after if it keeps happening. As for the distributor, I just replaced it with a new cam sensor. The truck was loping like...- 99Classic
- Post #6
- Forum: Engine Performance + Maintenance
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9
5.7 Vortec cold tap/knock HELP!
I'll give that a shot tomorrow, no CEL at the moment. Never had a knock sensor code either. I'll be sure to get back to you on shorting the spark. This started happening immediately after the top end repair. Beforehand she purred like a kitten with no noises. So I'd doubt I spun a bearing or...- 99Classic
- Post #3
- Forum: Engine Performance + Maintenance
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5.7 Vortec cold tap/knock HELP!
So about a year ago, my head gasket blew on my 99 Classic. Had the heads professionally redone and had the lifters, rockers etc out. Fixed it up nice. Since then I have had a real bad cold start tap/knock. Engine didnt exceed 100⁰C when the gaskets went. The truck has about 330,000km (about...- 99Classic
- Thread
- cold start knock vortec 350
- Replies: 37
- Forum: Engine Performance + Maintenance
